xen: Lots of changes from the commits listed below.

xen: Lots of changes from the commits listed below.

Squashed commit of the following:

commit c216cd59b911ae08c36dc29e285fbaa85a657786
Author: Ben Schweikert <trikolon@ipfire.org>
Date:   Thu Feb 9 20:05:47 2012 +0100

    Xen:
    	- Fixes errors in the xen.nm file with "provides".

commit 582314c60cf5c2ee1c5f2e25daddd4a44634cecf
Author: Ben Schweikert <trikolon@ipfire.org>
Date:   Thu Feb 9 19:49:25 2012 +0100

    Xen:
    	- Remove old xen-gcc-4.6.0 patch.

commit 6dc4e91966e0320be05b0a6f3f51f6249199642c
Author: Ben Schweikert <trikolon@ipfire.org>
Date:   Sun Feb 5 11:46:17 2012 +0100

    Xen:
    	* Some improvements from fedora xen upstream
    	* Some small bugfixes in xen-utils