unix: Allow to override compiler warning options without touching the rest.
unix: Allow to override compiler warning options without touching the rest.

Some people want to enable even more warnings. Let them do it without putting
burden on everyone. Some people vice versa think that current settings should
be relaxed. In this regard, -Werror is the most problematic, it disallows to
use #warning directive, and disallows to pass configuration settings on make
command lines. Again, until decided how to deal with these globally, allow to
work around these problems locally.

mgyenik/micropython,mpalomer/micropython,blazewicz/micropython,adafruit/micropython,aethaniel/micropython,xuxiaoxin/micropython,chrisdearman/micropython,torwag/micropython,hiway/micropython,selste/micropython,lbattraw/micropython,alex-robbins/micropython,skybird6672/micropython,PappaPeppar/micropython,drrk/micropython,adafruit/circuitpython,PappaPeppar/micropython,jlillest/micropython,KISSMonX/micropython,rubencabrera/micropython,Timmenem/micropython,dmazzella/micropython,neilh10/micropython,puuu/micropython,matthewelse/micropython,mhoffma/micropython,dxxb/micropython,dmazzella/micropython,feilongfl/micropython,matthewelse/micropython,utopiaprince/micropython,praemdonck/micropython,dhylands/micropython,HenrikSolver/micropython,cloudformdesign/micropython,SungEun-Steve-Kim/test-mp,deshipu/micropython,blmorris/micropython,turbinenreiter/micropython,trezor/micropython,noahwilliamsson/micropython,blazewicz/micropython,dhylands/micropython,toolmacher/micropython,KISSMonX/micropython,oopy/micropython,martinribelotta/micropython,Vogtinator/micropython,henriknelson/micropython,heisewangluo/micropython,firstval/micropython,mgyenik/micropython,swegener/micropython,trezor/micropython,dhylands/micropython,cwyark/micropython,tobbad/micropython,omtinez/micropython,omtinez/micropython,cnoviello/micropython,vriera/micropython,vriera/micropython,adamkh/micropython,alex-robbins/micropython,MrSurly/micropython-esp32,turbinenreiter/micropython,torwag/micropython,micropython/micropython-esp32,blmorris/micropython,xhat/micropython,pozetroninc/micropython,methoxid/micropystat,ericsnowcurrently/micropython,cloudformdesign/micropython,MrSurly/micropython,mgyenik/micropython,heisewangluo/micropython,firstval/micropython,EcmaXp/micropython,MrSurly/micropython-esp32,stonegithubs/micropython,hosaka/micropython,xyb/micropython,adafruit/circuitpython,slzatz/micropython,ernesto-g/micropython,ganshun666/micropython,AriZuu/micropython,galenhz/micropython,noahwilliamsson/micropython,redbear/micropython,MrSurly/micropython,stonegithubs/micropython,mhoffma/micropython,paul-xxx/micropython,selste/micropython,SHA2017-badge/micropython-esp32,toolmacher/micropython,henriknelson/micropython,MrSurly/micropython,oopy/micropython,martinribelotta/micropython,tuc-osg/micropython,hiway/micropython,vitiral/micropython,drrk/micropython,dmazzella/micropython,kerneltask/micropython,EcmaXp/micropython,micropython/micropython-esp32,ruffy91/micropython,misterdanb/micropython,tobbad/micropython,cwyark/micropython,feilongfl/micropython,tralamazza/micropython,ryannathans/micropython,cwyark/micropython,hiway/micropython,mhoffma/micropython,HenrikSolver/micropython,lowRISC/micropython,tobbad/micropython,jmarcelino/pycom-micropython,skybird6672/micropython,adafruit/micropython,EcmaXp/micropython,jmarcelino/pycom-micropython,Timmenem/micropython,pozetroninc/micropython,emfcamp/micropython,slzatz/micropython,mpalomer/micropython,rubencabrera/micropython,feilongfl/micropython,supergis/micropython,ryannathans/micropython,selste/micropython,selste/micropython,EcmaXp/micropython,omtinez/micropython,ruffy91/micropython,galenhz/micropython,kerneltask/micropython,HenrikSolver/micropython,xuxiaoxin/micropython,redbear/micropython,adamkh/micropython,lbattraw/micropython,ernesto-g/micropython,ahotam/micropython,ericsnowcurrently/micropython,Peetz0r/micropython-esp32,toolmacher/micropython,aethaniel/micropython,ChuckM/micropython,heisewangluo/micropython,jmarcelino/pycom-micropython,emfcamp/micropython,firstval/micropython,firstval/micropython,infinnovation/micropython,kostyll/micropython,PappaPeppar/micropython,alex-robbins/micropython,tuc-osg/micropython,deshipu/micropython,infinnovation/micropython,pozetroninc/micropython,ruffy91/micropython,adafruit/micropython,dhylands/micropython,adafruit/circuitpython,infinnovation/micropython,aethaniel/micropython,ericsnowcurrently/micropython,jimkmc/micropython,lbattraw/micropython,galenhz/micropython,mgyenik/micropython,ruffy91/micropython,swegener/micropython,dinau/micropython,kostyll/micropython,xhat/micropython,redbear/micropython,supergis/micropython,jimkmc/micropython,cloudformdesign/micropython,danicampora/micropython,blmorris/micropython,skybird6672/micropython,lbattraw/micropython,Vogtinator/micropython,warner83/micropython,blmorris/micropython,hosaka/micropython,alex-robbins/micropython,cloudformdesign/micropython,Peetz0r/micropython-esp32,mianos/micropython,xhat/micropython,danicampora/micropython,xhat/micropython,redbear/micropython,micropython/micropython-esp32,adafruit/circuitpython,utopiaprince/micropython,tralamazza/micropython,suda/micropython,aethaniel/micropython,tobbad/micropython,pramasoul/micropython,tuc-osg/micropython,Vogtinator/micropython,xuxiaoxin/micropython,SHA2017-badge/micropython-esp32,misterdanb/micropython,dinau/micropython,adafruit/micropython,supergis/micropython,stonegithubs/micropython,infinnovation/micropython,Peetz0r/micropython-esp32,tdautc19841202/micropython,vriera/micropython,adamkh/micropython,HenrikSolver/micropython,Vogtinator/micropython,martinribelotta/micropython,oopy/micropython,trezor/micropython,henriknelson/micropython,TDAbboud/micropython,methoxid/micropystat,ceramos/micropython,aethaniel/micropython,SungEun-Steve-Kim/test-mp,slzatz/micropython,neilh10/micropython,vriera/micropython,methoxid/micropystat,pfalcon/micropython,chrisdearman/micropython,dmazzella/micropython,dinau/micropython,adamkh/micropython,tdautc19841202/micropython,xyb/micropython,HenrikSolver/micropython,rubencabrera/micropython,dxxb/micropython,ryannathans/micropython,noahchense/micropython,cnoviello/micropython,SHA2017-badge/micropython-esp32,ernesto-g/micropython,tdautc19841202/micropython,methoxid/micropystat,xuxiaoxin/micropython,pramasoul/micropython,tuc-osg/micropython,dxxb/micropython,xyb/micropython,lowRISC/micropython,tobbad/micropython,xyb/micropython,dhylands/micropython,alex-march/micropython,orionrobots/micropython,kerneltask/micropython,turbinenreiter/micropython,deshipu/micropython,kostyll/micropython,trezor/micropython,KISSMonX/micropython,vitiral/micropython,jmarcelino/pycom-micropython,oopy/micropython,blazewicz/micropython,henriknelson/micropython,torwag/micropython,chrisdearman/micropython,swegener/micropython,omtinez/micropython,kostyll/micropython,paul-xxx/micropython,slzatz/micropython,jlillest/micropython,chrisdearman/micropython,cnoviello/micropython,noahchense/micropython,hiway/micropython,mhoffma/micropython,mpalomer/micropython,jimkmc/micropython,noahwilliamsson/micropython,jmarcelino/pycom-micropython,hosaka/micropython,matthewelse/micropython,turbinenreiter/micropython,blazewicz/micropython,misterdanb/micropython,deshipu/micropython,cwyark/micropython,Timmenem/micropython,ahotam/micropython,warner83/micropython,dxxb/micropython,pfalcon/micropython,pfalcon/micropython,pramasoul/micropython,ChuckM/micropython,galenhz/micropython,methoxid/micropystat,supergis/micropython,warner83/micropython,orionrobots/micropython,misterdanb/micropython,stonegithubs/micropython,firstval/micropython,bvernoux/micropython,feilongfl/micropython,skybird6672/micropython,KISSMonX/micropython,utopiaprince/micropython,ernesto-g/micropython,blazewicz/micropython,Timmenem/micropython,vitiral/micropython,bvernoux/micropython,danicampora/micropython,AriZuu/micropython,tralamazza/micropython,kerneltask/micropython,suda/micropython,alex-march/micropython,xuxiaoxin/micropython,orionrobots/micropython,ganshun666/micropython,paul-xxx/micropython,emfcamp/micropython,oopy/micropython,skybird6672/micropython,neilh10/micropython,drrk/micropython,ceramos/micropython,toolmacher/micropython,noahchense/micropython,Timmenem/micropython,mianos/micropython,lowRISC/micropython,praemdonck/micropython,paul-xxx/micropython,puuu/micropython,Vogtinator/micropython,mianos/micropython,drrk/micropython,EcmaXp/micropython,suda/micropython,swegener/micropython,omtinez/micropython,ganshun666/micropython,PappaPeppar/micropython,vitiral/micropython,dinau/micropython,suda/micropython,SungEun-Steve-Kim/test-mp,turbinenreiter/micropython,TDAbboud/micropython,noahchense/micropython,noahwilliamsson/micropython,cwyark/micropython,puuu/micropython,AriZuu/micropython,orionrobots/micropython,cnoviello/micropython,praemdonck/micropython,heisewangluo/micropython,matthewelse/micropython,MrSurly/micropython-esp32,xhat/micropython,rubencabrera/micropython,adamkh/micropython,supergis/micropython,dxxb/micropython,orionrobots/micropython,ganshun666/micropython,pramasoul/micropython,alex-march/micropython,adafruit/micropython,ericsnowcurrently/micropython,danicampora/micropython,martinribelotta/micropython,paul-xxx/micropython,mpalomer/micropython,mianos/micropython,lbattraw/micropython,pfalcon/micropython,ahotam/micropython,pramasoul/micropython,noahchense/micropython,puuu/micropython,xyb/micropython,torwag/micropython,galenhz/micropython,kerneltask/micropython,pozetroninc/micropython,MrSurly/micropython,ceramos/micropython,TDAbboud/micropython,micropython/micropython-esp32,ruffy91/micropython,SHA2017-badge/micropython-esp32,hosaka/micropython,utopiaprince/micropython,tdautc19841202/micropython,vriera/micropython,TDAbboud/micropython,swegener/micropython,ahotam/micropython,adafruit/circuitpython,AriZuu/micropython,MrSurly/micropython-esp32,selste/micropython,jlillest/micropython,Peetz0r/micropython-esp32,henriknelson/micropython,noahwilliamsson/micropython,bvernoux/micropython,ceramos/micropython,blmorris/micropython,ChuckM/micropython,tralamazza/micropython,hiway/micropython,SungEun-Steve-Kim/test-mp,misterdanb/micropython,mpalomer/micropython,toolmacher/micropython,hosaka/micropython,warner83/micropython,KISSMonX/micropython,martinribelotta/micropython,AriZuu/micropython,alex-march/micropython,jlillest/micropython,cloudformdesign/micropython,danicampora/micropython,ernesto-g/micropython,infinnovation/micropython,slzatz/micropython,ryannathans/micropython,stonegithubs/micropython,micropython/micropython-esp32,alex-robbins/micropython,MrSurly/micropython,tdautc19841202/micropython,feilongfl/micropython,bvernoux/micropython,ceramos/micropython,matthewelse/micropython,ericsnowcurrently/micropython,chrisdearman/micropython,alex-march/micropython,ryannathans/micropython,emfcamp/micropython,torwag/micropython,ChuckM/micropython,redbear/micropython,praemdonck/micropython,lowRISC/micropython,rubencabrera/micropython,praemdonck/micropython,adafruit/circuitpython,utopiaprince/micropython,TDAbboud/micropython,matthewelse/micropython,bvernoux/micropython,pozetroninc/micropython,mianos/micropython,dinau/micropython,drrk/micropython,jimkmc/micropython,kostyll/micropython,cnoviello/micropython,mhoffma/micropython,heisewangluo/micropython,warner83/micropython,Peetz0r/micropython-esp32,neilh10/micropython,MrSurly/micropython-esp32,vitiral/micropython,puuu/micropython,neilh10/micropython,trezor/micropython,jimkmc/micropython,jlillest/micropython,deshipu/micropython,emfcamp/micropython,pfalcon/micropython,SHA2017-badge/micropython-esp32,mgyenik/micropython,SungEun-Steve-Kim/test-mp,ahotam/micropython,tuc-osg/micropython,PappaPeppar/micropython,suda/micropython,ChuckM/micropython,ganshun666/micropython,lowRISC/micropython