compiler:
  * don't allow to apply the same hint directive twice
  * change parser_e_proc_dir_not_allowed to more generic variant parser_e_dir_not_allowed - they are similar and 'procedure' prefix does not give more information about the error.
  * maybe_parse_hint_directives() uses procdef settings for initial values
  + add tests

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25720 3ad0048d-3df7-0310-abae-a5850022a9f2