gnu: linux-libre: Update to 5.12.5.
* gnu/packages/linux.scm (linux-libre-5.11-version, deblob-scripts-5.11,
linux-libre-5.11-pristine-source, linux-libre-5.11-source,
linux-libre-headers-5.11, linux-libre-5.11): Remove variables.
(linux-libre-version, linux-libre-pristine-source, linux-libre-source,
linux-libre): Update to the 5.12 kernel series.
(linux-libre-with-bpf): Update to the 5.12 kernel series.
* gnu/packages/aux-files/linux-libre/5.11-arm.conf,
gnu/packages/aux-files/linux-libre/5.11-arm64.conf,
gnu/packages/aux-files/linux-libre/5.11-i686.conf,
gnu/packages/aux-files/linux-libre/5.11-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
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