Backport build.rs fixes to 1.x. #1734

Job	Run time
Check Cross-Compilation on Rust nightly on Windows (nightly)	46s
Check Cross-Compilation (stable)	42s
Check Cross-Compilation on Rust nightly (nightly)	1m 25s
Check Cross-Compilation (beta)	41s
Check Cross-Compilation on Windows (stable)	1m 9s
Check Cross-Compilation on Windows (beta)	1m 6s
Fuzz Targets	47s
Rustfmt	4s
Test (stable)	13s
Test linux-raw support (ubuntu)	26s
Test (windows-latest)	11s
Test (msrv)	1m 50s
Test on Musl (ubuntu)	25s
Test linux-raw support (ubuntu-20.04)	25s
Test (windows-2019)	13s
Test (macos-latest)	14s
Test (macos-12)	13s
Test with Rust nightly (ubuntu)	24s
Test (beta)	20s
Test with Rust nightly (windows)	58s
Test (ubuntu-20.04)	17s
Test (aarch64-ubuntu)	28s
	13m 17s

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