Build: Ignore the vendor directory during the jsvalidate:build task.

Props netweb.
Fixes #45119.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43783 602fd350-edb4-49c9-b593-d223f7449a82

Gruntfile.js

@@ -603,7 +603,8 @@ module.exports = function(grunt) {
 				files: {
 					src: [
 						BUILD_DIR + 'wp-{admin,includes}/**/*.js',
-						BUILD_DIR + 'wp-content/themes/twenty*/**/*.js'
+						BUILD_DIR + 'wp-content/themes/twenty*/**/*.js',
+						'!' + BUILD_DIR + 'wp-includes/js/dist/vendor/*.js'
 					]
 				}
 			}