If a file path references a parent directory, transform it to ensure we keep inside the OUT_DIR #786
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…we keep inside the OUT_DIR Otherwise, source file paths like `../../../../foo.c` can result in writing `$CARGO_TARGET_DIR/foo.o`. This is a slightly more aggressive application of object path re-writing than strictly needed to ensure we don't have `OUT_DIR` escapes, but it should be perfectly effective.
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Otherwise, source file paths like
../../../../foo.ccan result in writing$CARGO_TARGET_DIR/foo.o(or worse escapes into the wider filesystem).This is a slightly more aggressive application of object path re-writing than strictly needed to ensure we don't have
OUT_DIRescapes, but it should be perfectly effective.