Add support for mips64-openwrt-linux-musl (#276) #534

Job	Run time
Rustfmt	15s
Test (x86_64-apple-darwin, stable, macos-latest)	2m 37s
Test (x86_64-unknown-linux-gnu, stable, ubuntu-latest)	4m 31s
Test (i686-unknown-linux-gnu, stable, ubuntu-latest)	3m 5s
Test (aarch64-apple-darwin, nightly, macos-latest)	2m 27s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest)	23m 42s
Test (x86_64-pc-windows-gnu, stable, ubuntu-latest)	7m 49s
Test (riscv64gc-unknown-linux-gnu, stable, ubuntu-latest)	3m 30s
Test (x86_64-unknown-linux-gnu, beta, ubuntu-latest)	4m 37s
Test (x86_64-unknown-linux-musl, stable, ubuntu-latest)	3m 9s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2022)	18m 47s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, installed)	22m 18s
Test (arm-unknown-linux-gnueabi, stable, ubuntu-latest)	3m 30s
Test (loongarch64-unknown-linux-gnu, stable, ubuntu-latest)	3m 42s
Test (x86_64-pc-windows-msvc, stable-x86_64-msvc, windows-latest, yes)	22m 17s
Test (aarch64-unknown-linux-gnu, stable, ubuntu-latest)	3m 45s
Test (x86_64-unknown-linux-gnu, nightly, ubuntu-latest)	4m 26s
Test (i686-pc-windows-msvc, stable-i686-msvc, windows-2022, yes)	19m 17s
	2h 33m 44s

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