builder: only print the thirdparty object rebuilding line with '-v'

vlib/v/builder/cc.v

@@ -880,8 +880,9 @@ fn (mut v Builder) build_thirdparty_obj_file(path string, moduleflags []cflag.CF
 		os.cp(obj_path, opath) or { panic(err) }
 		return
 	}
+	if v.pref.is_verbose {
 		println(rebuild_reason_message)
-	//
+	}
 	// prepare for tcc, it needs relative paths to thirdparty/tcc to work:
 	current_folder := os.getwd()
 	os.chdir(os.dir(pref.vexe_path())) or {}