openblas: More consistent condition for 64-bit idx
openblas: More consistent condition for 64-bit idx

Use same condition for calling the actual package rule that is used for defining the package name for the 64-bit indexing version of OpenBLAS.
oroppas/MINGW-packages,stahta01/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,Alexpux/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,oscarfv/MINGW-packages,oscarfv/MINGW-packages,JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,oroppas/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages,oroppas/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,oscarfv/MINGW-packages,oscarfv/MINGW-packages,oroppas/MINGW-packages,stahta01/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,lhmouse/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages