gnu: Add linux-libre 6.4
* gnu/packages/linux.scm (linux-libre-6.4-version, linux-libre-6.4-gnu-revision,
deblob-scripts-6.4, linux-libre-6.4-pristine-source, linux-libre-6.4-source,
linux-libre-headers-6.4, linux-libre-6.4: New variables.
* gnu/packages/aux-files/linux-libre/6.4-arm.conf,
* gnu/packages/aux-files/linux-libre/6.4-arm64.conf,
* gnu/packages/aux-files/linux-libre/6.4-i686.conf,
* gnu/packages/aux-files/linux-libre/6.4-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Add them.
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