Fix modos.c to compile for the STM32F4Discovery board (which doesn't have an sdcard)
Fix modos.c to compile for the STM32F4Discovery board (which doesn't have an sdcard)

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