gnu: linux: Move configuration files to "aux-files".
* gnu/packages/linux-libre-4.1-i686.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.1-i686.conf: ... this.
* gnu/packages/linux-libre-4.1-x86_64.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.1-x86_64.conf: ... this.
* gnu/packages/linux-libre-4.4-i686.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.4-i686.conf: ... this.
* gnu/packages/linux-libre-4.4-x86_64.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.4-x86_64.conf: ... this.
* gnu/packages/linux-libre-4.9-i686.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.9-i686.conf: ... this.
* gnu/packages/linux-libre-4.9-x86_64.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.9-x86_64.conf: ... this.
* gnu/packages/linux-libre-4.10-i686.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.10-i686.conf: ... this.
* gnu/packages/linux-libre-4.10-x86_64.conf: Rename to...
* gnu/packages/aux-files/linux-libre/4.10-x86_64.conf: ... this.
* gnu/packages/linux.scm (kernel-config): Use 'search-auxiliary-file' to
find configuration files.
* Makefile.am (KCONFIGS): Rename to...
(AUX_FILES): ... this. Adjust accordingly.
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