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CCACHE_CPP2 is no longer a thing and hasn't been for ~10y. There are other ways to configure icecream that isn't CCACHE_PREFIX, so remove the broken and special-casey detection while at it. The right thing to check would be to run `ccache -k prefix_command` or so (and even so `mk_add_option` would bypass it). It seems nobody had regenerated the metrics doc in a while... Differential Revision: https://phabricator.services.mozilla.com/D295254