Darwin/Mac: Also exclude OS X generated source
Darwin/Mac: Also exclude OS X generated source

biosbits/libffi,johne53/MB3Libffi,bgarrels/libffi,davibe/libffi,nmav/libffi,bgarrels/libffi,johne53/MB3Libffi,zwaldowski/libffi-iOS,johne53/MB3Libffi,bgarrels/libffi,nmav/libffi,Distrotech/libffi,johne53/MB3Libffi,biosbits/libffi,Pan7/libffi,s1341/libffi,joshtriplett/libffi,davibe/libffi,zwaldowski/libffi-iOS,Distrotech/libffi,Distrotech/libffi,rth7680/libffi,davibe/libffi,zwaldowski/libffi-iOS,plicease/libffi,Pan7/libffi,bgarrels/libffi,zwaldowski/libffi-iOS,plicease/libffi,rth7680/libffi,joshtriplett/libffi,johne53/MB3Libffi,biosbits/libffi,s1341/libffi,rth7680/libffi,nmav/libffi,Distrotech/libffi,s1341/libffi,nmav/libffi,Pan7/libffi,rth7680/libffi,plicease/libffi,plicease/libffi,biosbits/libffi,joshtriplett/libffi,zwaldowski/libffi-iOS,joshtriplett/libffi,s1341/libffi,Pan7/libffi,davibe/libffi