Fix #6805: add --enable-ccache configure option#6813

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pnkfelix wants to merge 1 commit intorust-lang:incomingfrom pnkfelix:fsk-issue-6805-ccache-support

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Commits on May 29, 2013

Fix rust-lang#6805 : add --enable-ccache configure option to prefix compiler invocations with ccache to attempt to reuse common results, e.g. for LLVM (re)builds.
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