Backport build.rs fixes to 1.x. #1735

Job	Run time
Check Cross-Compilation on Windows (stable)	1m 0s
Check Cross-Compilation on Windows (beta)	54s
Check Cross-Compilation on Rust nightly on Windows (nightly)	45s
Check Cross-Compilation on Rust nightly (nightly)	1m 24s
Check Cross-Compilation (stable)	36s
Rustfmt	8s
Check Cross-Compilation (beta)	44s
Test (stable)	1s
Test linux-raw support (ubuntu)	26s
Test (windows-latest)	16s
Test on Musl (ubuntu)	33s
Test linux-raw support (ubuntu-20.04)	26s
Test (windows-2019)	18s
Test with Rust nightly (ubuntu)	28s
Test (macos-latest)	15s
Test (macos-12)	31s
Test with Rust nightly (windows)	39s
Test (beta)	18s
Test (ubuntu-20.04)	28s
Fuzz Targets	46s
Test (aarch64-ubuntu)	30s
Test (msrv)	1m 48s
	13m 14s

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