* don't print a 'smart link requires external linker' warning in _any_ of the
  following cases:
  1) external linking is already enabled
  2) target does not support an internal linker
  3) the 'omit linking stage' option is used



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27543 3ad0048d-3df7-0310-abae-a5850022a9f2