* correct dlopen flag values for Darwin (patch by lks, mantis #23979)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23771 3ad0048d-3df7-0310-abae-a5850022a9f2
  * fixed definition of GLHandleARB for Darwin (patch by lks, mantis #23975)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23772 3ad0048d-3df7-0310-abae-a5850022a9f2