Don't remove debian subdirectory if it exists on git cleanup.
Don't remove debian subdirectory if it exists on git cleanup.

This doesn't harm if you don't build a Debian package as `git cleanup` will work
just fine if the `debian` directory does not exist. Without this patch the
`distclean` rule will also remove the `debian` directory which make it
impossible to correctly build a debian package.

xpndlabs/kivy,jffernandez/kivy,jkankiewicz/kivy,bob-the-hamster/kivy,yoelk/kivy,eHealthAfrica/kivy,thezawad/kivy,aron-bordin/kivy,vipulroxx/kivy,Ramalus/kivy,JohnHowland/kivy,rafalo1333/kivy,andnovar/kivy,rafalo1333/kivy,jffernandez/kivy,iamutkarshtiwari/kivy,angryrancor/kivy,youprofit/kivy,Farkal/kivy,eHealthAfrica/kivy,Cheaterman/kivy,xiaoyanit/kivy,darkopevec/kivy,andnovar/kivy,Shyam10/kivy,mSenyor/kivy,akshayaurora/kivy,kived/kivy,kivy/kivy,vitorio/kivy,youprofit/kivy,mSenyor/kivy,autosportlabs/kivy,gonzafirewall/kivy,Farkal/kivy,thezawad/kivy,viralpandey/kivy,Shyam10/kivy,matham/kivy,eHealthAfrica/kivy,jehutting/kivy,rnixx/kivy,darkopevec/kivy,xpndlabs/kivy,JohnHowland/kivy,darkopevec/kivy,manashmndl/kivy,el-ethan/kivy,bob-the-hamster/kivy,jegger/kivy,CuriousLearner/kivy,arlowhite/kivy,vitorio/kivy,xpndlabs/kivy,bob-the-hamster/kivy,janssen/kivy,tony/kivy,aron-bordin/kivy,bionoid/kivy,xiaoyanit/kivy,LogicalDash/kivy,darkopevec/kivy,edubrunaldi/kivy,denys-duchier/kivy,KeyWeeUsr/kivy,arcticshores/kivy,rnixx/kivy,autosportlabs/kivy,KeyWeeUsr/kivy,rafalo1333/kivy,manashmndl/kivy,CuriousLearner/kivy,CuriousLearner/kivy,eHealthAfrica/kivy,dirkjot/kivy,vipulroxx/kivy,VinGarcia/kivy,dirkjot/kivy,manthansharma/kivy,JohnHowland/kivy,vipulroxx/kivy,denys-duchier/kivy,niavlys/kivy,LogicalDash/kivy,Ramalus/kivy,Ramalus/kivy,Farkal/kivy,bionoid/kivy,el-ethan/kivy,gonzafirewall/kivy,habibmasuro/kivy,inclement/kivy,dirkjot/kivy,niavlys/kivy,MiyamotoAkira/kivy,inclement/kivy,andnovar/kivy,viralpandey/kivy,arlowhite/kivy,bliz937/kivy,cbenhagen/kivy,vipulroxx/kivy,cbenhagen/kivy,arcticshores/kivy,Cheaterman/kivy,yoelk/kivy,ehealthafrica-ci/kivy,dirkjot/kivy,inclement/kivy,LogicalDash/kivy,adamkh/kivy,Cheaterman/kivy,bhargav2408/kivy,Shyam10/kivy,jegger/kivy,gonzafirewall/kivy,arcticshores/kivy,tony/kivy,MiyamotoAkira/kivy,matham/kivy,Cheaterman/kivy,VinGarcia/kivy,thezawad/kivy,denys-duchier/kivy,arlowhite/kivy,janssen/kivy,bhargav2408/kivy,bliz937/kivy,arcticshores/kivy,Shyam10/kivy,youprofit/kivy,mSenyor/kivy,kived/kivy,angryrancor/kivy,edubrunaldi/kivy,denys-duchier/kivy,bhargav2408/kivy,ernstp/kivy,MiyamotoAkira/kivy,jkankiewicz/kivy,kivy/kivy,bionoid/kivy,habibmasuro/kivy,jehutting/kivy,jkankiewicz/kivy,ehealthafrica-ci/kivy,angryrancor/kivy,manthansharma/kivy,viralpandey/kivy,niavlys/kivy,cbenhagen/kivy,bob-the-hamster/kivy,iamutkarshtiwari/kivy,KeyWeeUsr/kivy,xiaoyanit/kivy,jffernandez/kivy,janssen/kivy,tony/kivy,ehealthafrica-ci/kivy,edubrunaldi/kivy,aron-bordin/kivy,akshayaurora/kivy,kived/kivy,JohnHowland/kivy,manthansharma/kivy,jehutting/kivy,jffernandez/kivy,KeyWeeUsr/kivy,MiyamotoAkira/kivy,matham/kivy,gonzafirewall/kivy,yoelk/kivy,el-ethan/kivy,ernstp/kivy,aron-bordin/kivy,LogicalDash/kivy,kivy/kivy,ernstp/kivy,VinGarcia/kivy,jkankiewicz/kivy,bionoid/kivy,jegger/kivy,yoelk/kivy,jegger/kivy,ehealthafrica-ci/kivy,akshayaurora/kivy,Farkal/kivy,habibmasuro/kivy,manashmndl/kivy,autosportlabs/kivy,bliz937/kivy,angryrancor/kivy,iamutkarshtiwari/kivy,manthansharma/kivy,vitorio/kivy,matham/kivy,adamkh/kivy,rnixx/kivy,janssen/kivy,niavlys/kivy,adamkh/kivy,adamkh/kivy,ernstp/kivy