Don't cache Rust compiles with incremental compilation. Fixes #257 #259
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…#257 rustc's incremental compilation mode isn't well-handled by sccache currently because we don't cache the separate artifacts it creates. Additionally, if there are existing incremental artifacts it's likely that rustc will do a better job than sccache anyway, so don't bother trying to cache Rust compilation when incremental compilation is enabled for now. Longer-term we would like to make sccache and rustc incremental work together nicely: mozilla#236
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rustc's incremental compilation mode isn't well-handled by sccache currently
because we don't cache the separate artifacts it creates. Additionally,
if there are existing incremental artifacts it's likely that rustc will do
a better job than sccache anyway, so don't bother trying to cache Rust
compilation when incremental compilation is enabled for now.
Longer-term we would like to make sccache and rustc incremental work
together nicely: #236