fix 'No matching SDK for arch i386' build error.
fix 'No matching SDK for arch i386' build error.

Oops - there was a bug here.  i386 is a valid arch for all SDKs.  Fixes

trello/xctool,AutoScout24/xctool,jspahrsummers/xctool,soundcloud/xctool,n054/xctool,dvor/xctool,kamoljan/xctool,bhamiltoncx/xctool,leopardpan/xctool,kernandreas/xctool,kernandreas/xctool,agreco/xctool,modulexcite/xctool,Richardlihui/xctool,jspahrsummers/xctool,SuPair/xctool,githubdelegate/xctool,n054/xctool,kernandreas/xctool,agreco/xctool,theiren46/xctool,duk42111/xctool,ACChe/xctool,FiftyThree/xctool,AutoScout24/xctool,Richardlihui/xctool,adamjernst/xctool,1yvT0s/xctool,Monits/xctool,theiren46/xctool,lpios/xctool,ACChe/xctool,1yvT0s/xctool,lpios/xctool,PSPDFKit-labs/xctool,PSPDFKit-labs/xctool,PSPDFKit-labs/xctool,ekingo/xctool,Monits/xctool,FiftyThree/xctool,Monits/xctool,facebook/xctool,LegNeato/xctool,jspahrsummers/xctool,blighli/xctool,agreco/xctool,1yvT0s/xctool,AutoScout24/xctool,theiren46/xctool,kernandreas/xctool,soundcloud/xctool,jspahrsummers/xctool,dvor/xctool,yaoxiaoyong/xctool,Richardlihui/xctool,facebook/xctool,ekingo/xctool,bgertzfield/xctool,Monits/xctool,facebook/xctool,blighli/xctool,kamoljan/xctool,yaoxiaoyong/xctool,PSPDFKit-labs/xctool,n054/xctool,blighli/xctool,githubdelegate/xctool,dvor/xctool,ACChe/xctool,PSPDFKit-labs/xctool,lpios/xctool,adamjernst/xctool,n054/xctool,FiftyThree/xctool,duk42111/xctool,facebook/xctool,SuPair/xctool,lpios/xctool,lpios/xctool,SuPair/xctool,n054/xctool,Richardlihui/xctool,kamoljan/xctool,bhamiltoncx/xctool,soundcloud/xctool,n054/xctool,LegNeato/xctool,SuPair/xctool,trello/xctool,bgertzfield/xctool,trello/xctool,bhamiltoncx/xctool,adamjernst/xctool,adamjernst/xctool,LegNeato/xctool,soundcloud/xctool,theiren46/xctool,yaoxiaoyong/xctool,dvor/xctool,agreco/xctool,leopardpan/xctool,AutoScout24/xctool,modulexcite/xctool,ekingo/xctool,LegNeato/xctool,bhamiltoncx/xctool,bgertzfield/xctool,soundcloud/xctool,lpios/xctool,leopardpan/xctool,githubdelegate/xctool,bhamiltoncx/xctool,bgertzfield/xctool,soundcloud/xctool,yaoxiaoyong/xctool,trello/xctool,githubdelegate/xctool,kamoljan/xctool,bhamiltoncx/xctool,blighli/xctool,modulexcite/xctool,facebook/xctool,ACChe/xctool,duk42111/xctool,ekingo/xctool,FiftyThree/xctool,modulexcite/xctool,duk42111/xctool,bgertzfield/xctool,ACChe/xctool,facebook/xctool,leopardpan/xctool,1yvT0s/xctool,bgertzfield/xctool,ACChe/xctool