gnu: linux-libre: Add version 5.3.1.
* gnu/packages/linux.scm (linux-libre-5.3-version)
(linux-libre-5.3-pristine-source, linux-libre-5.3-source)
(linux-libre-headers-5.3, linux-libre-5.3): New public variables.
* gnu/packages/aux-files/linux-libre/5.3-arm.conf,
gnu/packages/aux-files/linux-libre/5.3-arm-veyron.conf,
gnu/packages/aux-files/linux-libre/5.3-arm64.conf,
gnu/packages/aux-files/linux-libre/5.3-i686.conf,
gnu/packages/aux-files/linux-libre/5.3-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Add them.
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