HEAD attempts to include gpgme.h

[Geoffrey Leach <geoff cdepot net>]

HEAD current as of this writing configured (explicitly, yet) --withoug-gpgme fails to compile.

In file included from gmime-gpgme-context.c:27:
gmime-gpgme-context.h:32:19: gpgme.h: No such file or directory
In file included from gmime-gpgme-context.h:33,
                 from gmime-gpgme-context.c:27:
gmime-gpgme-signature.h:24:19: gpgme.h: No such file or directory
In file included from gmime-gpgme-context.h:33,
                 from gmime-gpgme-context.c:27: