Twenty Seventeen: Provide a background color fallback for non-webkit browsers on input styles

This allows the styles to work correctly when modified by high contrast computer setups.

Merge of [39388] to the 4.7 branch.

Props presskopp.
See #38939.
Built from https://develop.svn.wordpress.org/branches/4.7@39389


git-svn-id: http://core.svn.wordpress.org/branches/4.7@39329 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentyseventeen/style.css

@@ -933,6 +933,7 @@ input[type="datetime-local"],
 input[type="color"],
 textarea {
 	color: #666;
+	background: #fff;
 	background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0), rgba(255, 255, 255, 0));
 	border: 1px solid #bbb;
 	-webkit-border-radius: 3px;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-RC1-39387';
+$wp_version = '4.7-RC1-39389';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.