Backport build.rs fixes to 1.x. #1739

Job	Run time
Rustfmt	10s
Check Cross-Compilation on Rust nightly (nightly)	1m 3s
Check Cross-Compilation on Windows (stable)	58s
Check Cross-Compilation (stable)	50s
Check Cross-Compilation on Windows (beta)	53s
Check Cross-Compilation (beta)	55s
Fuzz Targets	47s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 4s
Test linux-raw support (ubuntu)	23s
Test (stable)	20s
Test linux-raw support (ubuntu-20.04)	1s
Test (msrv)	1m 47s
Test (windows-latest)	21s
Test on Musl (ubuntu)	34s
Test (windows-2019)	23s
Test with Rust nightly (ubuntu)	4s
Test (macos-latest)	30s
Test with Rust nightly (windows)	46s
Test (macos-12)	37s
Test (beta)	25s
Test (ubuntu-20.04)	25s
Test (aarch64-ubuntu)	34s
	13m 50s

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