Auto-accept ccache >= 3.1 on Mac
Auto-accept ccache >= 3.1 on Mac

The reason for the selective rejection of everything but a patched
ccache on Mac was broken objective-c/c++ support and a memory
corruption on arg parse - both are fixed on 3.0 and 3.1,
respectively. See http://ccache.samba.org/releasenotes.html

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