cdylib: use core instead of std

[folkertdev]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
fuzz-compress	40.87% <ø> (ø)
fuzz-decompress	30.78% <ø> (-0.26%)	⬇️
test-aarch64-apple-darwin	93.28% <100.00%> (+<0.01%)	⬆️
test-x86_64-apple-darwin	91.70% <100.00%> (-0.03%)	⬇️
test-x86_64-unknown-linux-gnu	90.25% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
libz-rs-sys-cdylib/src/gz.rs	91.21% <100.00%> (ø)

... and 3 files with indirect coverage changes

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