[linux310][linux316] Backport of 'compiler-gcc: integrate the various compiler-gcc[345].h'

[Philip MÃller]

This is a multi-part message in MIME format.Hi Willy, hi Ben,

I've backported the 'compiler-gcc: integrate the various
compiler-gcc[345].h' patch to support gcc 6.1 series also for linux 3.10
and 3.16 stable series.

kind regards

Philip MÃller
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Manjaro Project Lead