linux: Remove obsolete Linux 4.8-rc8

Linux 4.8.4 is available, and no system uses Linux 4.8-rc8 anymore. So remove it. ``` $ pssh -i -H "`hostconfig --list mx64`" uname -a | grep "4.8.0-rc8" $ ```
mariux64 · Oct 24, 2016 · 506f7dd · 506f7dd
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commit 506f7dd
Showing 1 changed file with 0 additions and 79 deletions.
diff --git a/linux-4.8_rc8-105.bee b/linux-4.8_rc8-105.bee