Backport build.rs fixes to 2.x. #1727

Job	Run time
Check Cross-Compilation on Rust nightly (nightly)	2m 7s
Check Cross-Compilation on Rust nightly on Windows (nightly)	57s
Check Cross-Compilation (stable)	45s
Check Cross-Compilation on Windows (stable)	45s
Fuzz Targets	44s
Check Cross-Compilation (beta)	48s
Check Cross-Compilation on Windows (beta)	48s
Rustfmt	6s
Test (stable)	9s
Test linux-raw support (ubuntu)	31s
Test (msrv)	2m 19s
Test (windows-latest)	10s
Test linux-raw support (ubuntu-20.04)	28s
Test on Musl (ubuntu)	44s
Test (windows-2019)	11s
Test (macos-latest)	15s
Test with Rust nightly (ubuntu)	29s
Test (macos-12)	12s
Test with Rust nightly (windows)	45s
Test (beta)	17s
Test (ubuntu-20.04)	22s
Test (aarch64-ubuntu)	24s
	14m 16s

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