libnl: don't patch libnl-3.0.pc

libnl: don't patch libnl-3.0.pc

This patch originally came from oe-classic in 2010 with the comment "fix pc file
so that it actually links to the support libraries".  If an application wants to
link to the support libraries then it should be using the relevant .pc files to
do so.

oe-core builds successfully with this patch removed and other distributions
don't carry it, so drop the patch.

(From OE-Core rev: f4a544f46e2a58e64e90d92855d1d85966eefa10)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>