gnu: Remove linux-libre 6.16.
* gnu/packages/linux.scm (linux-libre-6.16-version,
linux-libre-6.16-gnu-revision, deblob-scripts-6.16,
linux-libre-6.16-pristine-source, linux-libre-6.16-source,
linux-libre-headers-6.16, linux-libre-6.16, linux-libre-arm64-mnt-reform-6.16):
Remove variables.
* gnu/packages/aux-files/linux-libre/6.16-arm.conf,
gnu/packages/aux-files/linux-libre/6.16-arm64.conf,
gnu/packages/aux-files/linux-libre/6.16-i686.conf,
gnu/packages/aux-files/linux-libre/6.16-riscv.conf,
gnu/packages/aux-files/linux-libre/6.16-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
Change-Id: I20755e7f0622211879db0f6aa8f9d11cea0ba28c