Putting public functions back.

In case some plugins are using them.

includes/wc-core-functions.php

@@ -1997,6 +1997,31 @@ function wc_delete_expired_transients() {
 }
 add_action( 'woocommerce_installed', 'wc_delete_expired_transients' );
 
+/**
+ * Make a URL relative, if possible.
+ *
+ * @since 3.2.0
+ * @param string $url URL to make relative.
+ * @return string
+ */
+function wc_get_relative_url( $url ) {
+	return wc_is_external_resource( $url ) ? $url : str_replace( array( 'http://', 'https://' ), '//', $url );
+}
+
+
+/**
+ * See if a resource is remote.
+ *
+ * @since 3.2.0
+ * @param string $url URL to check.
+ * @return bool
+ */
+function wc_is_external_resource( $url ) {
+	$wp_base = str_replace( array( 'http://', 'https://' ), '//', get_home_url( null, '/', 'http' ) );
+
+	return strstr( $url, '://' ) && ! strstr( $url, $wp_base );
+}
+
 /**
  * See if theme/s is activate or not.
  *