Make workspace check on non-Linux platforms

[fasterthanlime]

Logical follow-up to #93

[fasterthanlime]

This is looking pretty good, I still want to get in:

• Rename IntoSplit into IntoHalves to avoid clashing with tokio's TcpStream::into_split
• Use bytemuck's TransparentWrapper rather than use std::mem::transmute

Setting up CI for macOS/Windows (cf. #98) can be done in a separate branch. Those probably won't run h2spec.

[codecov]

Codecov Report

Merging #97 (f27689e) into main (498d8c8) will increase coverage by 0.02%.
The diff coverage is 34.27%.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   78.18%   78.20%   +0.02%     
==========================================
  Files          28       36       +8     
  Lines        5575     5718     +143     
==========================================
+ Hits         4359     4472     +113     
- Misses       1216     1246      +30     

Impacted Files	Coverage Δ
crates/hring-bingo-ktls/src/linux.rs	0.00% <0.00%> (ø)
crates/hring-bingo-ktls/src/main.rs	25.00% <0.00%> (+24.58%)	⬆️
crates/hring-buffet/src/lib.rs	85.18% <ø> (ø)
crates/hring-buffet/src/piece.rs	49.61% <ø> (ø)
crates/hring/src/h1/body.rs	88.32% <ø> (ø)
crates/hring/src/h1/client.rs	92.68% <ø> (ø)
crates/hring/src/h1/encode.rs	79.56% <ø> (ø)
crates/hring/src/h1/server.rs	80.32% <ø> (ø)
crates/hring/src/h2/encode.rs	70.12% <0.00%> (ø)
crates/hring/src/lib.rs	100.00% <ø> (ø)
... and 17 more

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