Backport build.rs fixes to 1.x. #1741

Job	Run time
Rustfmt	7s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 33s
Check Cross-Compilation (stable)	52s
Check Cross-Compilation on Windows (stable)	1m 22s
Check Cross-Compilation (beta)	5s
Check Cross-Compilation on Rust nightly (nightly)	1m 6s
Check Cross-Compilation on Windows (beta)	1m 20s
Test (stable)	20s
Test with Rust nightly (ubuntu)	31s
Test (windows-latest)	1m 21s
Fuzz Targets	46s
Test with Rust nightly (windows)	1m 13s
Test (windows-2019)	1m 26s
Test (macos-latest)	24s
Test (macos-12)	41s
Test linux-raw support (ubuntu)	23s
Test (beta)	26s
Test linux-raw support (ubuntu-20.04)	27s
Test (ubuntu-20.04)	26s
Test (aarch64-ubuntu)	50s
Test (msrv)	1m 47s
Test on Musl (ubuntu)	33s
	17m 59s

Provide feedback