builtinimport.c: Recognize "namespace package" and error out as unsupported.
builtinimport.c: Recognize "namespace package" and error out as unsupported.

See http://www.python.org/dev/peps/pep-0420/#specification for spec. See
https://github.com/micropython/micropython/issues/298 for the discussion
of the implemented behavior.

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