gnu: linux-libre: Update to 5.13.6.
* gnu/packages/linux.scm (linux-libre-5.12-version, deblob-scripts-5.12
linux-libre-5.12-pristine-source, linux-libre-5.12-source,
linux-libre-headers-5.12, linux-libre-5.12): Remove variables.
(linux-libre-version, linux-libre-pristine-source, linux-libre-source,
linux-libre): Update to the 5.13 kernel series.
(linux-libre-with-bpf): Update to 5.13 kernel series.
* gnu/packages/aux-files/linux-libre/5.12-arm.conf,
gnu/packages/aux-files/linux-libre/5.12-arm64.conf,
gnu/packages/aux-files/linux-libre/5.12-i686.conf,
gnu/packages/aux-files/linux-libre/5.12-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
4f108e4e5c