Fix cargo_target_empty_cfg test with env var.
#9225
Merged
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The test
cargo_target_empty_cfgdoes not work if the environment variableCARGO_TARGET_DIRis set.Configshould not be looking at the "real" environment, but insteadself.envwhich is controlled during tests.I also did some minor style/cleanup changes.
Unblocks upstream sync.