Sync with rustix' build.rs changes (#58) #1651

Job	Run time
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 28s
Check Cross-Compilation on Rust nightly (nightly)	1m 50s
Check Cross-Compilation (stable)	52s
Check Cross-Compilation on Windows (stable)	1m 25s
Check Cross-Compilation (beta)	50s
Fuzz Targets	58s
Rustfmt	15s
Check Cross-Compilation on Windows (beta)	1m 31s
Test linux-raw support (ubuntu)	34s
Test (stable)	31s
Test on Musl (ubuntu)	44s
Test (msrv)	1m 30s
Test (windows-latest)	1m 36s
Test linux-raw support (ubuntu-20.04)	33s
Test (windows-2019)	1m 47s
Test (macos-latest)	1m 0s
Test with Rust nightly (ubuntu)	31s
Test with Rust nightly (windows)	1m 26s
Test (macos-11)	1m 9s
Test (beta)	30s
Test (ubuntu-20.04)	39s
Test (aarch64-ubuntu)	2m 33s
	24m 12s

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