Add missing files so that make distcheck works again,

* tests/openpgp/Makefile.am (CLEANFILES): Add created file
"passphrases".
* tools/Makefile.am (EXTRA_DIST): Add no-libgcrypt.c.

dirmngr/Makefile uses a copy no-libgcrypt.c from tools/. tools/ does
not anymore require no-libgcrypt.c but we keep it there in case we
eventually make use of it again.

• Signed-off-by: Werner Koch <wk@gnupg.org>