py/smallint: Allow to override MP_SMALL_INT_MIN et al.
py/smallint: Allow to override MP_SMALL_INT_MIN et al.

This allows a port to specify exactly how many bits are in a small
int (eg for a uPy bytecode cross compiler).

henriknelson/micropython,ryannathans/micropython,selste/micropython,trezor/micropython,hosaka/micropython,bvernoux/micropython,tuc-osg/micropython,alex-robbins/micropython,chrisdearman/micropython,praemdonck/micropython,mhoffma/micropython,tralamazza/micropython,jmarcelino/pycom-micropython,ganshun666/micropython,oopy/micropython,pramasoul/micropython,adafruit/micropython,supergis/micropython,matthewelse/micropython,turbinenreiter/micropython,bvernoux/micropython,pramasoul/micropython,redbear/micropython,alex-march/micropython,jmarcelino/pycom-micropython,galenhz/micropython,MrSurly/micropython,jmarcelino/pycom-micropython,mhoffma/micropython,MrSurly/micropython-esp32,pfalcon/micropython,ganshun666/micropython,galenhz/micropython,deshipu/micropython,trezor/micropython,matthewelse/micropython,torwag/micropython,swegener/micropython,dinau/micropython,pramasoul/micropython,tobbad/micropython,deshipu/micropython,Timmenem/micropython,henriknelson/micropython,tralamazza/micropython,hosaka/micropython,micropython/micropython-esp32,adamkh/micropython,AriZuu/micropython,matthewelse/micropython,danicampora/micropython,hiway/micropython,dxxb/micropython,galenhz/micropython,EcmaXp/micropython,trezor/micropython,toolmacher/micropython,pramasoul/micropython,pozetroninc/micropython,PappaPeppar/micropython,micropython/micropython-esp32,tuc-osg/micropython,mhoffma/micropython,AriZuu/micropython,dinau/micropython,dmazzella/micropython,mianos/micropython,swegener/micropython,Peetz0r/micropython-esp32,praemdonck/micropython,supergis/micropython,matthewelse/micropython,drrk/micropython,PappaPeppar/micropython,puuu/micropython,toolmacher/micropython,drrk/micropython,turbinenreiter/micropython,blazewicz/micropython,lowRISC/micropython,alex-robbins/micropython,adafruit/circuitpython,infinnovation/micropython,alex-march/micropython,EcmaXp/micropython,tralamazza/micropython,dmazzella/micropython,drrk/micropython,blazewicz/micropython,redbear/micropython,dmazzella/micropython,mhoffma/micropython,chrisdearman/micropython,swegener/micropython,SHA2017-badge/micropython-esp32,Timmenem/micropython,cwyark/micropython,oopy/micropython,adamkh/micropython,redbear/micropython,EcmaXp/micropython,pozetroninc/micropython,deshipu/micropython,TDAbboud/micropython,selste/micropython,pramasoul/micropython,adamkh/micropython,dxxb/micropython,toolmacher/micropython,galenhz/micropython,bvernoux/micropython,jmarcelino/pycom-micropython,pozetroninc/micropython,dxxb/micropython,dxxb/micropython,drrk/micropython,mpalomer/micropython,adafruit/circuitpython,supergis/micropython,adafruit/micropython,misterdanb/micropython,mianos/micropython,oopy/micropython,pozetroninc/micropython,adafruit/circuitpython,selste/micropython,mhoffma/micropython,micropython/micropython-esp32,pfalcon/micropython,swegener/micropython,misterdanb/micropython,MrSurly/micropython,HenrikSolver/micropython,dinau/micropython,danicampora/micropython,Peetz0r/micropython-esp32,puuu/micropython,chrisdearman/micropython,torwag/micropython,lowRISC/micropython,tobbad/micropython,PappaPeppar/micropython,deshipu/micropython,cwyark/micropython,hiway/micropython,EcmaXp/micropython,blazewicz/micropython,ganshun666/micropython,cwyark/micropython,misterdanb/micropython,blazewicz/micropython,mpalomer/micropython,kerneltask/micropython,emfcamp/micropython,dxxb/micropython,emfcamp/micropython,AriZuu/micropython,hosaka/micropython,chrisdearman/micropython,TDAbboud/micropython,bvernoux/micropython,adamkh/micropython,infinnovation/micropython,lowRISC/micropython,hosaka/micropython,adamkh/micropython,jmarcelino/pycom-micropython,drrk/micropython,turbinenreiter/micropython,pfalcon/micropython,TDAbboud/micropython,selste/micropython,MrSurly/micropython-esp32,alex-march/micropython,Peetz0r/micropython-esp32,supergis/micropython,hiway/micropython,toolmacher/micropython,turbinenreiter/micropython,mianos/micropython,micropython/micropython-esp32,puuu/micropython,ryannathans/micropython,Timmenem/micropython,torwag/micropython,HenrikSolver/micropython,kerneltask/micropython,turbinenreiter/micropython,SHA2017-badge/micropython-esp32,deshipu/micropython,Peetz0r/micropython-esp32,trezor/micropython,PappaPeppar/micropython,tuc-osg/micropython,alex-march/micropython,MrSurly/micropython-esp32,redbear/micropython,MrSurly/micropython-esp32,pfalcon/micropython,oopy/micropython,tobbad/micropython,swegener/micropython,henriknelson/micropython,hosaka/micropython,HenrikSolver/micropython,puuu/micropython,tobbad/micropython,alex-march/micropython,SHA2017-badge/micropython-esp32,galenhz/micropython,cwyark/micropython,dmazzella/micropython,mianos/micropython,MrSurly/micropython,infinnovation/micropython,pfalcon/micropython,MrSurly/micropython-esp32,supergis/micropython,tralamazza/micropython,kerneltask/micropython,TDAbboud/micropython,praemdonck/micropython,selste/micropython,alex-robbins/micropython,lowRISC/micropython,henriknelson/micropython,torwag/micropython,dinau/micropython,micropython/micropython-esp32,adafruit/circuitpython,oopy/micropython,danicampora/micropython,pozetroninc/micropython,ryannathans/micropython,kerneltask/micropython,infinnovation/micropython,tuc-osg/micropython,matthewelse/micropython,adafruit/micropython,henriknelson/micropython,chrisdearman/micropython,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,kerneltask/micropython,adafruit/circuitpython,dinau/micropython,puuu/micropython,hiway/micropython,blazewicz/micropython,praemdonck/micropython,emfcamp/micropython,TDAbboud/micropython,ryannathans/micropython,tuc-osg/micropython,toolmacher/micropython,ganshun666/micropython,mpalomer/micropython,mpalomer/micropython,adafruit/micropython,hiway/micropython,MrSurly/micropython,Timmenem/micropython,HenrikSolver/micropython,HenrikSolver/micropython,EcmaXp/micropython,adafruit/circuitpython,emfcamp/micropython,redbear/micropython,infinnovation/micropython,Peetz0r/micropython-esp32,AriZuu/micropython,lowRISC/micropython,misterdanb/micropython,tobbad/micropython,alex-robbins/micropython,cwyark/micropython,mpalomer/micropython,danicampora/micropython,ganshun666/micropython,PappaPeppar/micropython,praemdonck/micropython,mianos/micropython,alex-robbins/micropython,torwag/micropython,adafruit/micropython,emfcamp/micropython,trezor/micropython,matthewelse/micropython,AriZuu/micropython,Timmenem/micropython,misterdanb/micropython,MrSurly/micropython,bvernoux/micropython,danicampora/micropython,ryannathans/micropython