[ccache] auto-disabling ccache when gcc gets plugins?

Martin Pool mbp at sourcefrog.net
Thu Oct 18 18:18:58 MDT 2012

Disabling all caching because any plugins are used seems like a bit of
overkill: while they _can_ be impure, I wonder if most will be?  But
probably disabling when MELT is present would be reasonable.

There is existing code to disable caching when particular flags are present
so it should be a one-line fix.

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