Enable no_std when std feature is not enabled

[RRRadicalEdward]

The primary motivation is to be able to use Rust's allocator (via the rust-allocator feature flag) when targeting no_std.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
fuzz-compress	?
fuzz-decompress	?
test-aarch64-apple-darwin	91.10% <100.00%> (-0.02%)	⬇️
test-aarch64-unknown-linux-gnu	85.11% <100.00%> (-0.04%)	⬇️
test-i686-unknown-linux-gnu	84.60% <100.00%> (-0.03%)	⬇️
test-x86_64-apple-darwin	89.94% <100.00%> (-0.02%)	⬇️
test-x86_64-unknown-linux-gnu	93.26% <100.00%> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
zlib-rs/src/allocate.rs	95.13% <100.00%> (ø)
zlib-rs/src/lib.rs	89.28% <ø> (ø)

... and 3 files with indirect coverage changes

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[folkertdev]

Nice. To make sure this keeps working, can you add this configuration to the CI checks too? As a part of link-c-dynamic-library maybe, it already has some similar configurations.

[RRRadicalEdward]

Nice. To make sure this keeps working, can you add this configuration to the CI checks too? As a part of link-c-dynamic-library maybe, it already has some similar configurations.

Sure!