pic16bit: Add basic unistd.h file since it's not provided by tool chain.
pic16bit: Add basic unistd.h file since it's not provided by tool chain.

ChuckM/micropython,torwag/micropython,TDAbboud/micropython,ganshun666/micropython,danicampora/micropython,xhat/micropython,SHA2017-badge/micropython-esp32,cwyark/micropython,danicampora/micropython,lowRISC/micropython,redbear/micropython,blmorris/micropython,neilh10/micropython,MrSurly/micropython-esp32,Timmenem/micropython,TDAbboud/micropython,micropython/micropython-esp32,mhoffma/micropython,mianos/micropython,hiway/micropython,emfcamp/micropython,vitiral/micropython,tralamazza/micropython,misterdanb/micropython,oopy/micropython,galenhz/micropython,bvernoux/micropython,matthewelse/micropython,tobbad/micropython,mianos/micropython,vriera/micropython,jlillest/micropython,PappaPeppar/micropython,torwag/micropython,blmorris/micropython,ericsnowcurrently/micropython,supergis/micropython,pfalcon/micropython,ericsnowcurrently/micropython,AriZuu/micropython,bvernoux/micropython,omtinez/micropython,puuu/micropython,emfcamp/micropython,alex-march/micropython,MrSurly/micropython-esp32,Peetz0r/micropython-esp32,Timmenem/micropython,ryannathans/micropython,SHA2017-badge/micropython-esp32,omtinez/micropython,chrisdearman/micropython,torwag/micropython,ChuckM/micropython,dinau/micropython,orionrobots/micropython,deshipu/micropython,ericsnowcurrently/micropython,noahwilliamsson/micropython,adamkh/micropython,EcmaXp/micropython,mhoffma/micropython,oopy/micropython,tralamazza/micropython,pozetroninc/micropython,selste/micropython,turbinenreiter/micropython,pfalcon/micropython,dhylands/micropython,adamkh/micropython,pfalcon/micropython,pozetroninc/micropython,dxxb/micropython,Peetz0r/micropython-esp32,kerneltask/micropython,tuc-osg/micropython,TDAbboud/micropython,vitiral/micropython,orionrobots/micropython,vitiral/micropython,omtinez/micropython,blazewicz/micropython,drrk/micropython,pramasoul/micropython,omtinez/micropython,orionrobots/micropython,omtinez/micropython,infinnovation/micropython,xuxiaoxin/micropython,misterdanb/micropython,cwyark/micropython,swegener/micropython,infinnovation/micropython,blmorris/micropython,blazewicz/micropython,dxxb/micropython,xhat/micropython,oopy/micropython,HenrikSolver/micropython,xuxiaoxin/micropython,misterdanb/micropython,selste/micropython,lowRISC/micropython,trezor/micropython,jmarcelino/pycom-micropython,Timmenem/micropython,danicampora/micropython,SHA2017-badge/micropython-esp32,lowRISC/micropython,HenrikSolver/micropython,ernesto-g/micropython,dmazzella/micropython,Peetz0r/micropython-esp32,toolmacher/micropython,toolmacher/micropython,deshipu/micropython,adafruit/micropython,Timmenem/micropython,cwyark/micropython,xuxiaoxin/micropython,blazewicz/micropython,oopy/micropython,blmorris/micropython,rubencabrera/micropython,dxxb/micropython,xuxiaoxin/micropython,jlillest/micropython,henriknelson/micropython,puuu/micropython,EcmaXp/micropython,neilh10/micropython,turbinenreiter/micropython,AriZuu/micropython,swegener/micropython,drrk/micropython,henriknelson/micropython,ganshun666/micropython,noahwilliamsson/micropython,adafruit/circuitpython,PappaPeppar/micropython,HenrikSolver/micropython,pozetroninc/micropython,ChuckM/micropython,SHA2017-badge/micropython-esp32,emfcamp/micropython,lowRISC/micropython,mianos/micropython,TDAbboud/micropython,swegener/micropython,trezor/micropython,pramasoul/micropython,emfcamp/micropython,dhylands/micropython,galenhz/micropython,oopy/micropython,mpalomer/micropython,vriera/micropython,Timmenem/micropython,micropython/micropython-esp32,galenhz/micropython,vriera/micropython,mpalomer/micropython,selste/micropython,noahwilliamsson/micropython,kerneltask/micropython,adamkh/micropython,rubencabrera/micropython,micropython/micropython-esp32,ChuckM/micropython,xhat/micropython,orionrobots/micropython,pramasoul/micropython,galenhz/micropython,adafruit/circuitpython,jlillest/micropython,misterdanb/micropython,rubencabrera/micropython,toolmacher/micropython,selste/micropython,cloudformdesign/micropython,ruffy91/micropython,hiway/micropython,henriknelson/micropython,dhylands/micropython,matthewelse/micropython,pramasoul/micropython,jmarcelino/pycom-micropython,toolmacher/micropython,alex-robbins/micropython,matthewelse/micropython,jmarcelino/pycom-micropython,dhylands/micropython,matthewelse/micropython,trezor/micropython,Peetz0r/micropython-esp32,EcmaXp/micropython,PappaPeppar/micropython,matthewelse/micropython,noahwilliamsson/micropython,MrSurly/micropython-esp32,tobbad/micropython,redbear/micropython,praemdonck/micropython,trezor/micropython,dinau/micropython,hosaka/micropython,hiway/micropython,danicampora/micropython,cwyark/micropython,ernesto-g/micropython,deshipu/micropython,misterdanb/micropython,ganshun666/micropython,drrk/micropython,praemdonck/micropython,rubencabrera/micropython,PappaPeppar/micropython,puuu/micropython,infinnovation/micropython,alex-march/micropython,supergis/micropython,galenhz/micropython,jmarcelino/pycom-micropython,pfalcon/micropython,ganshun666/micropython,puuu/micropython,Peetz0r/micropython-esp32,mpalomer/micropython,tralamazza/micropython,blazewicz/micropython,danicampora/micropython,emfcamp/micropython,selste/micropython,ernesto-g/micropython,dmazzella/micropython,praemdonck/micropython,adafruit/circuitpython,tobbad/micropython,turbinenreiter/micropython,ryannathans/micropython,mhoffma/micropython,cwyark/micropython,ruffy91/micropython,hiway/micropython,feilongfl/micropython,orionrobots/micropython,blazewicz/micropython,redbear/micropython,turbinenreiter/micropython,cloudformdesign/micropython,infinnovation/micropython,ernesto-g/micropython,adafruit/micropython,micropython/micropython-esp32,xuxiaoxin/micropython,tuc-osg/micropython,ruffy91/micropython,dinau/micropython,MrSurly/micropython,vitiral/micropython,ericsnowcurrently/micropython,pozetroninc/micropython,redbear/micropython,adafruit/circuitpython,alex-march/micropython,chrisdearman/micropython,martinribelotta/micropython,hosaka/micropython,bvernoux/micropython,supergis/micropython,turbinenreiter/micropython,chrisdearman/micropython,dmazzella/micropython,vriera/micropython,torwag/micropython,martinribelotta/micropython,bvernoux/micropython,henriknelson/micropython,hosaka/micropython,trezor/micropython,pozetroninc/micropython,AriZuu/micropython,dhylands/micropython,dinau/micropython,ChuckM/micropython,feilongfl/micropython,ganshun666/micropython,kerneltask/micropython,xhat/micropython,dmazzella/micropython,MrSurly/micropython,feilongfl/micropython,cloudformdesign/micropython,tralamazza/micropython,alex-march/micropython,hosaka/micropython,pramasoul/micropython,swegener/micropython,mpalomer/micropython,deshipu/micropython,blmorris/micropython,chrisdearman/micropython,ruffy91/micropython,adafruit/micropython,alex-march/micropython,tuc-osg/micropython,ryannathans/micropython,martinribelotta/micropython,redbear/micropython,PappaPeppar/micropython,dinau/micropython,matthewelse/micropython,EcmaXp/micropython,neilh10/micropython,chrisdearman/micropython,mhoffma/micropython,adamkh/micropython,tuc-osg/micropython,drrk/micropython,adafruit/micropython,praemdonck/micropython,hiway/micropython,ryannathans/micropython,dxxb/micropython,swegener/micropython,alex-robbins/micropython,feilongfl/micropython,kerneltask/micropython,alex-robbins/micropython,martinribelotta/micropython,mianos/micropython,vitiral/micropython,xhat/micropython,torwag/micropython,rubencabrera/micropython,adafruit/circuitpython,AriZuu/micropython,toolmacher/micropython,alex-robbins/micropython,henriknelson/micropython,MrSurly/micropython-esp32,martinribelotta/micropython,tobbad/micropython,praemdonck/micropython,mpalomer/micropython,adafruit/micropython,infinnovation/micropython,neilh10/micropython,HenrikSolver/micropython,ericsnowcurrently/micropython,puuu/micropython,supergis/micropython,cloudformdesign/micropython,SHA2017-badge/micropython-esp32,MrSurly/micropython,AriZuu/micropython,dxxb/micropython,micropython/micropython-esp32,drrk/micropython,lowRISC/micropython,tuc-osg/micropython,kerneltask/micropython,deshipu/micropython,alex-robbins/micropython,neilh10/micropython,bvernoux/micropython,feilongfl/micropython,MrSurly/micropython,TDAbboud/micropython,adafruit/circuitpython,MrSurly/micropython-esp32,jlillest/micropython,noahwilliamsson/micropython,vriera/micropython,ernesto-g/micropython,jmarcelino/pycom-micropython,mianos/micropython,MrSurly/micropython,ryannathans/micropython,mhoffma/micropython,tobbad/micropython,EcmaXp/micropython,jlillest/micropython,hosaka/micropython,cloudformdesign/micropython,ruffy91/micropython,pfalcon/micropython,supergis/micropython,HenrikSolver/micropython,adamkh/micropython