gnu: linux-libre: Update to 5.14.7.
* gnu/packages/linux.scm (linux-libre-5.13-version,
linux-libre-5.13-gnu-revision, linux-libre-5.13-pristine-source,
linux-libre-5.13-source, linux-libre-headers-5.13, linux-libre-5.13): Remove
variables.
(linux-libre-version, linux-libre-gnu-revision, linux-libre-pristine-source,
linux-libre-source, linux-libre, linux-libre-with-bpf): Use 5.14.
* gnu/packages/aux-files/linux-libre/5.13-arm.conf,
gnu/packages/aux-files/linux-libre/5.13-arm64.conf,
gnu/packages/aux-files/linux-libre/5.13-i686.conf,
gnu/packages/aux-files/linux-libre/5.13-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
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