clang: Allow only CPython to import cindex
clang: Allow only CPython to import cindex

In PyPy this is an issue because cindex does not work and does not throw
any error either.

impmihai/coala,RJ722/coala,nemaniarjun/coala,stevemontana1980/coala,abhiroyg/coala,kartikeys98/coala,scottbelden/coala,SambitAcharya/coala,jayvdb/coala,scriptnull/coala,rresol/coala,arush0311/coala,ayushin78/coala,Tanmay28/coala,yland/coala,Shade5/coala,d6e/coala,sagark123/coala,Tanmay28/coala,ManjiriBirajdar/coala,FeodorFitsner/coala,netman92/coala,yland/coala,shreyans800755/coala,meetmangukiya/coala,refeed/coala,stevemontana1980/coala,swatilodha/coala,andreimacavei/coala,aptrishu/coala,SambitAcharya/coala,CruiseDevice/coala,dagdaggo/coala,NalinG/coala,arafsheikh/coala,sils1297/coala,Tanmay28/coala,coala-analyzer/coala,ayushin78/coala,tltuan/coala,ayushin78/coala,stevemontana1980/coala,yashLadha/coala,NiklasMM/coala,MattAllmendinger/coala,Tanmay28/coala,incorrectusername/coala,lonewolf07/coala,djkonro/coala,ManjiriBirajdar/coala,svsn2117/coala,yashtrivedi96/coala,coala-analyzer/coala,NiklasMM/coala,vinc456/coala,andreimacavei/coala,Asalle/coala,netman92/coala,lonewolf07/coala,netman92/coala,aptrishu/coala,tltuan/coala,FeodorFitsner/coala,scriptnull/coala,RJ722/coala,CruiseDevice/coala,nemaniarjun/coala,damngamerz/coala,Nosferatul/coala,aptrishu/coala,AdeshAtole/coala,coala/coala,Shade5/coala,NalinG/coala,abhiroyg/coala,SambitAcharya/coala,Uran198/coala,damngamerz/coala,yashLadha/coala,Balaji2198/coala,arush0311/coala,nemaniarjun/coala,karansingh1559/coala,kartikeys98/coala,rresol/coala,Balaji2198/coala,rimacone/testing2,AbdealiJK/coala,yland/coala,SambitAcharya/coala,rimacone/testing2,sils1297/coala,scriptnull/coala,NiklasMM/coala,MariosPanag/coala,damngamerz/coala,svsn2117/coala,rimacone/testing2,Asnelchristian/coala,karansingh1559/coala,AbdealiJK/coala,arjunsinghy96/coala,yashLadha/coala,Nosferatul/coala,yashtrivedi96/coala,yashtrivedi96/coala,ManjiriBirajdar/coala,shreyans800755/coala,AdeshAtole/coala,tltuan/coala,abhiroyg/coala,vinc456/coala,MariosPanag/coala,dagdaggo/coala,MattAllmendinger/coala,meetmangukiya/coala,NalinG/coala,SanketDG/coala,Balaji2198/coala,sagark123/coala,SanketDG/coala,scottbelden/coala,refeed/coala,saurabhiiit/coala,Tanmay28/coala,sagark123/coala,djkonro/coala,d6e/coala,arjunsinghy96/coala,sophiavanvalkenburg/coala,Asnelchristian/coala,coala/coala,kartikeys98/coala,Nosferatul/coala,scriptnull/coala,d6e/coala,SambitAcharya/coala,NalinG/coala,tushar-rishav/coala,FeodorFitsner/coala,saurabhiiit/coala,CruiseDevice/coala,saurabhiiit/coala,RJ722/coala,rresol/coala,sudheesh001/coala,Uran198/coala,mr-karan/coala,SambitAcharya/coala,sils1297/coala,SanketDG/coala,incorrectusername/coala,andreimacavei/coala,arush0311/coala,Asalle/coala,djkonro/coala,AdeshAtole/coala,sudheesh001/coala,Uran198/coala,NalinG/coala,NalinG/coala,NalinG/coala,arafsheikh/coala,AbdealiJK/coala,karansingh1559/coala,JohnS-01/coala,tushar-rishav/coala,swatilodha/coala,scottbelden/coala,Asnelchristian/coala,scriptnull/coala,sophiavanvalkenburg/coala,mr-karan/coala,swatilodha/coala,coala-analyzer/coala,meetmangukiya/coala,svsn2117/coala,vinc456/coala,impmihai/coala,shreyans800755/coala,arafsheikh/coala,lonewolf07/coala,JohnS-01/coala,tushar-rishav/coala,coala/coala,dagdaggo/coala,SambitAcharya/coala,sudheesh001/coala,jayvdb/coala,jayvdb/coala,MattAllmendinger/coala,scriptnull/coala,impmihai/coala,refeed/coala,arjunsinghy96/coala,scriptnull/coala,MariosPanag/coala,Tanmay28/coala,Tanmay28/coala,sophiavanvalkenburg/coala,JohnS-01/coala,Shade5/coala,Asalle/coala,Tanmay28/coala,mr-karan/coala,incorrectusername/coala