fix: self-clobber when updating/downgrading packages #893
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This fixes an issue where if you install
zlib=1.2
and then update tozlib=1.3
all files were detected as "clobbered".This made changes really slow (e.g. when changing the version of Rust) because the un-clobbering is not really an optimized function and is expected to run only for a few files.