expose gzvprintf

[folkertdev]

zlib-ng exposes this function (make sense) so we should too. We now also run tests with nightly, and get some extra coverage (though codecov does not display it, I do see the gzprintf coverage locally).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
fuzz-compress	37.53% <ø> (ø)
fuzz-decompress	27.66% <ø> (+0.12%)	⬆️
test-aarch64-apple-darwin	90.77% <ø> (ø)
test-aarch64-unknown-linux-gnu	88.60% <ø> (+0.01%)	⬆️
test-i686-unknown-linux-gnu	88.31% <ø> (-0.03%)	⬇️
test-x86_64-apple-darwin	89.80% <ø> (+0.01%)	⬆️
test-x86_64-unknown-linux-gnu	91.47% <100.00%> (+0.63%)	⬆️

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	89.85% <100.00%> (-0.35%)	⬇️

... and 4 files with indirect coverage changes

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