switching git branches doesn't change mixxx binary

[mixxxbot]

Reported by: ywwg
Date: 2014-12-07T20:43:52Z
Status: New
Importance: Low
Launchpad Issue: lp1400143

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Very minor: if I switch git branches and do scons, and no building is required, the binary doesn't get regenerated and I end up running a binary from the previous branch. Either the binary should be cached in the cache directory, or it should be deleted when git branches change. (I prefer the former)

[mixxxbot]

Duplicate of #7096