pgp: Added include config.h

gpgme.h checks _FILE_OFFSET_BITS macro and it's set at config.h

src/pgp/gpg.c

@@ -32,6 +32,8 @@
  *
  */
 
+#include "config.h"
+
 #include <locale.h>
 #include <string.h>
 #include <stdlib.h>