Sync with rustix' build.rs changes (#58) (#350) #1654

Job	Run time
Rustfmt	14s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 31s
Check Cross-Compilation (stable)	1m 20s
Check Cross-Compilation on Rust nightly (nightly)	2m 2s
Check Cross-Compilation (beta)	1m 18s
Check Cross-Compilation on Windows (stable)	1m 17s
Test (stable)	32s
Check Cross-Compilation on Windows (beta)	1m 16s
Test (windows-latest)	1m 34s
Test with Rust nightly (ubuntu)	33s
Fuzz Targets	47s
Test (windows-2019)	1m 34s
Test with Rust nightly (windows)	1m 35s
Test (macos-latest)	1m 0s
Test linux-raw support (ubuntu)	33s
Test (macos-11)	1m 10s
Test (msrv)	1m 23s
Test on Musl (ubuntu)	43s
Test linux-raw support (ubuntu-20.04)	32s
Test (beta)	31s
Test (ubuntu-20.04)	31s
Test (aarch64-ubuntu)	2m 28s
	24m 24s

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