Print the module name in help output (else the user has no way to link the vlc...

Print the module name in help output (else the user has no way to link the vlc --list output to that of the vlc <insert a help command here> output other than by trying all the modules in --list with vlc -p <module name>)
(cherry picked from commit bd69812b)

src/libvlc.c

@@ -1480,8 +1480,9 @@ static void Usage( libvlc_int_t *p_this, char const *psz_module_name )
         if( strcmp( "main", p_parser->psz_object_name ) )
         {
             if( b_color )
-                utf8_fprintf( stdout, "\n " GREEN "%s" GRAY "\n",
-                              p_parser->psz_longname );
+                utf8_fprintf( stdout, "\n " GREEN "%s" GRAY " (%s)\n",
+                              p_parser->psz_longname,
+                               p_parser->psz_object_name );
             else
                 utf8_fprintf( stdout, "\n %s\n", p_parser->psz_longname );
         }