gnu: Remove linux-libre 6.2.
This kernel series is no longer supported upstream.
* gnu/packages/linux.scm (linux-libre-6.2-version, linux-libre-6.2-gnu-revision,
deblob-scripts-6.2, linux-libre-6.2-pristine-source, linux-libre-6.2-source,
linux-libre-headers-6.2, linux-libre-6.2): Remove variables.
* gnu/packages/aux-files/linux-libre/6.2-arm.conf,
gnu/packages/aux-files/linux-libre/6.2-arm64.conf,
gnu/packages/aux-files/linux-libre/6.2-i686.conf,
gnu/packages/aux-files/linux-libre/6.2-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
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