Sync with rustix' build.rs changes (#58) #1648

Job	Run time
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 29s
Check Cross-Compilation on Windows (stable)	47s
Check Cross-Compilation on Rust nightly (nightly)	2m 2s
Check Cross-Compilation (stable)	49s
Check Cross-Compilation on Windows (beta)	45s
Fuzz Targets	47s
Check Cross-Compilation (beta)	52s
Rustfmt	14s
Test linux-raw support (ubuntu)	30s
Test (stable)	18s
Test linux-raw support (ubuntu-20.04)	29s
Test (msrv)	1m 25s
Test on Musl (ubuntu)	29s
Test (windows-latest)	15s
Test (windows-2019)	18s
Test with Rust nightly (ubuntu)	30s
Test (macos-latest)	25s
Test with Rust nightly (windows)	1m 29s
Test (macos-11)	14s
Test (beta)	18s
Test (ubuntu-20.04)	16s
Test (aarch64-ubuntu)	32s
	15m 13s

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