gnu: Add linux-libre 6.14.
* gnu/packages/linux.scm (linux-libre-6.14-version,
linux-libre-6.14-gnu-revision, deblob-scripts-6.14,
linux-libre-6.14-pristine-source, linux-libre-6.14-source,
linux-libre-headers-6.14, linux-libre-6.14): New variables.
(linux-libre-headers-latest): Use linux-libre-headers-6.14.
* gnu/packages/aux-files/linux-libre/6.14-arm.conf,
gnu/packages/aux-files/linux-libre/6.14-arm64.conf,
gnu/packages/aux-files/linux-libre/6.14-i686.conf,
gnu/packages/aux-files/linux-libre/6.14-riscv.conf,
gnu/packages/aux-files/linux-libre/6.14-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Add them.
Change-Id: I09bc4e47fbe0172b5172f27b03a1b6bd88421fff