[pan] fix (gpg.cc): put back inclusion of gmime.h

[Dominique Dumont <ddumont src gnome org>]

commit 0147cef08f00305cdef8b44dccd7bfd4c2a1f740
Author: Dominique Dumont <dod debian org>
Date:   Fri Sep 23 18:34:32 2022 +0200

    fix (gpg.cc): put back inclusion of gmime.h
    
    When pan is compiled with --with-gmime-crypto, compilation of gpg.cc
    fails without this inclusion

 pan/usenet-utils/gpg.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/pan/usenet-utils/gpg.h b/pan/usenet-utils/gpg.h
index e96ec37..70a3234 100644
--- a/pan/usenet-utils/gpg.h
+++ b/pan/usenet-utils/gpg.h
@@ -24,6 +24,7 @@
 
 #ifdef HAVE_GMIME_CRYPTO
 
+#include <gmime/gmime.h>
 #include <map>
 #include <vector>