makefiles: Disable implicit rules.

This improves the time of a full-tree build with no out-of-date objects from
~3.7s to ~0.7s on one of my development machines.

Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

tools/makedep.c

@@ -4076,6 +4076,9 @@ static void output_dependencies( struct makefile *make )
     }
     else output_stub_makefile( make );
 
+    /* disable implicit rules */
+    output( ".SUFFIXES:\n" );
+
     fclose( output_file );
     output_file = NULL;
     rename_temp_file( output_file_name );