* gnu/packages/linux.scm (linux-libre): Update to 4.8. * gnu/packages/linux-libre-4.7-x86_64.conf, gnu/packages/linux-libre-4.7-i686.conf: Delete files. * gnu/packages/linux-libre-4.8-x86_64.conf, gnu/packages/linux-libre-4.8-i686.conf: New files. * Makefile.am (KCONFIGS): Update accordingly.