Always remove index.php from request before contructing page links. f…

…ixes #5000

git-svn-id: http://svn.automattic.com/wordpress/trunk@6144 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/link-template.php

@@ -501,7 +501,8 @@ function get_pagenum_link($pagenum = 1) {
 		}
 
 		$request = preg_replace( '|page/(.+)/?$|', '', $request);
-		$request = preg_replace( '|^index\.php/|', '', $request);
+		$request = preg_replace( '|^index\.php|', '', $request);
+		$request = ltrim($request, '/');
 
 		$base = trailingslashit( get_bloginfo( 'url' ) );