Tests select when to use --cfg debug, regardless of configure settings. #8020
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Remove directive, if present, from CFG_RUSTC_FLAGS.
r? @huonw
Fix #7898.
(One alternative tack is to build up distinct CFG_TEST_RUSTC_FLAGS
alongside CFG_RUSTC_FLAGS; but currently debug is the only --cfg flag
ever added to CFG_RUSTC_FLAGS; the other contents of CFG_RUSTC_FLAGS
are a mix of -Z flags and a few other switches like O, which seem to
make sense to propogate to the tests.)