gnu: Remove linux-libre 6.11.
This kernel series is no longer supported upstream.
* gnu/packages/linux.scm (linux-libre-6.11-version,
linux-libre-6.11-gnu-revision, deblob-scripts-6.11,
linux-libre-6.11-pristine-source, linux-libre-6.11-source,
linux-libre-headers-6.11, linux-libre-6.11): Remove variables.
the commit message for your changes. Lines starting
* gnu/packages/aux-files/linux-libre/6.11-arm.conf,
gnu/packages/aux-files/linux-libre/6.11-arm64.conf,
gnu/packages/aux-files/linux-libre/6.11-i686.conf,
gnu/packages/aux-files/linux-libre/6.11-riscv.conf,
gnu/packages/aux-files/linux-libre/6.11-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.
Change-Id: I71ae7696534b2096de5ffb650bf8a8313e907edb