prepare for compiler module rename (#2323)

compiler/modules.v

@@ -47,7 +47,7 @@ fn (v &V) find_module_path(mod string) ?string {
 	// First check for local modules in the same directory
 	mut import_path := os.getwd() + '${os.path_separator}$mod_path'
 	// Now search in vlib/
-	if !os.dir_exists(import_path) {
+	if mod == 'compiler' || !os.dir_exists(import_path) {
 		import_path = '$v.lang_dir${os.path_separator}vlib${os.path_separator}$mod_path'
 	}
 	//println('ip=$import_path')