Include language provider files only when they are needed

The attached patch should fix the issue and slighly improve readability:

+++ modules/locale/locale.module	13 Jul 2010 08:41:55 -0000
@@ -973,13 +973,12 @@ function locale_url_outbound_alter(&$pat
+            $callbacks[$provider['callbacks']['url_rewrite']] = TRUE;

The callbacks array is indexed by the callback function to avoid duplicates, so the actual values are unrelevant: by changing NULL to TRUE we should covey the idea that the callback is actually used also at a first glance.

#1: language-852524-1.patch queued for re-testing.

Bugs are fixed in the development version first, backported then.

The patch still applies.

@oriol_e9g:

Since you just rerolled it I think it's fine if you RTBC it, I definitely cannot :)