* exec.c [__CYGWIN32__]: Keep cygwin separate from Mingw32;

we don't need it here as it behaves more like a Posix system.
* passphrase.c (agent_get_passphrase): Ditto.
* tdbio.c (MY_O_BINARY): Need binary mode with Cygwin.

* g10.c, gpgv.c (main) [__CYGWIN32__]: Don't get the homedir from
the registry.

g10/gpgv.c

@@ -164,11 +164,11 @@ main( int argc, char **argv )
     opt.always_trust = 1;
     opt.batch = 1;
 
-  #if defined (__MINGW32__) || defined (__CYGWIN32__)
+#if defined (__MINGW32__)
     set_homedir (read_w32_registry_string( NULL, "Software\\GNU\\GnuPG", "HomeDir" ));
-  #else
+#else
     set_homedir (getenv("GNUPGHOME"));
-  #endif
+#endif
     if( !*opt.homedir ) {
       set_homedir (GNUPG_HOMEDIR);
     }