gnu: linux-libre: Update to 3.15.6

[Jason Self]

* gnu/packages/linux.scm (linux-libre): Update to version 3.15.6.

Changelog, for those so interested:
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.6

0001-gnu-linux-libre-Update-to-3.15.6.patch
Description: Binary data

signature.asc

Description: PGP signature