Update UML target to 3.10 and various improvements

Updated target to 3.10.36.
Added mconsole exec patch.
Added pseudo-random MAC patch (from NetKit).

Signed-off-by: Markus Stenberg <markus.stenberg@iki.fi>
Reviewed-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41172 3c298f89-4303-0410-b956-a3cf2f4a3e73