[cxxmodules] Remove the requres objc clause allowing to load libGCocoa.so
[cxxmodules] Remove the requres objc clause allowing to load libGCocoa.so

This should fix the failing roottest-root-html-runMakeIndex on OSX with
-Druntime_cxxmodules=On

Patch by Alexander Penev!

olifre/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,olifre/root