core: Add public function gpgme_get_ctx_flag.
* src/gpgme.h.in (gpgme_get_ctx_flag): New. * src/gpgme.c (gpgme_set_ctx_flag): Move down the file and add a trace statement. (gpgme_get_ctx_flag): New. * src/gpgme.def, src/libgpgme.vers: Add new interface.
- Signed-off-by: Werner Koch <wk@gnupg.org>