tests: Do not run all tests unless in maintainer mode.

* configure.ac: Leak the maintainer mode flag into 'config.h'.
* tests/gpgscm/ffi.c: Pass it into the scheme environment.
* tests/openpgp/all-tests.scm: Only run tests against non-default
configurations (keyring, extended-key-format) in maintainer mode.
--

Werner is concerned that the tests do take up too much time and asked
me to reduce the runtime of the tests for normal users.

Signed-off-by: Justus Winter <justus@g10code.com>

tests/gpgscm/ffi.c

@@ -1442,6 +1442,14 @@ ffi_init (scheme *sc, const char *argv0, const char *scriptname,
 #endif
               );
 
+  ffi_define (sc, "*maintainer-mode*",
+#if MAINTAINER_MODE
+              sc->T
+#else
+              sc->F
+#endif
+              );
+
 
   ffi_define (sc, "*stdin*",
               sc->vptr->mk_port_from_file (sc, stdin, port_input));