General: Replace `substr_compare()` usage in the `str_ends_with()` polyfill.

This avoids a warning on PHP < 7.2.18 if haystack is an empty string:
{{{
Warning: substr_compare(): The start position cannot exceed initial string length
}}}

Follow-up to [52040], [55158], [55990], [56014].

See #58220.
Built from https://develop.svn.wordpress.org/trunk@56015


git-svn-id: http://core.svn.wordpress.org/trunk@55527 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/compat.php

@@ -488,7 +488,7 @@ if ( ! function_exists( 'str_ends_with' ) ) {
 
 		$len = strlen( $needle );
 
-		return 0 === substr_compare( $haystack, $needle, -$len, $len );
+		return $needle === substr( $haystack, -$len, $len );
 	}
 }
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-56014';
+$wp_version = '6.3-alpha-56015';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.