Disable MIPS in CI. (#793) #3331

Job	Run time
Rustfmt	8s
Check nightly-only targets (nightly)	27s
Check --no-default-features (nightly)	1m 19s
Check selected Tier 3 platforms (nightly)	3m 28s
Check (stable)	4m 32s
Check (nightly)	4m 14s
Check (1.48)	9m 29s
Test use-libc (ubuntu)	46s
Test use-libc (i686-linux)	1m 38s
Test (ubuntu)	49s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 40s
Test use-libc (aarch64-linux)	3m 19s
Test (ubuntu-20.04)	49s
Test use-libc (powerpc64le-linux)	1m 15s
Test (i686-linux)	1m 19s
Test use-libc (riscv64-linux)	1m 1s
Test (aarch64-linux)	1m 25s
Test use-libc (arm-linux)	1m 7s
Test (powerpc64le-linux)	1m 28s
Test (riscv64-linux)	1m 23s
Test (s390x-linux)	1m 50s
Test (arm-linux)	1m 7s
Test (ubuntu-stable)	52s
Test (ubuntu-1.48)	4m 28s
Test (i686-linux-stable)	1m 28s
Test (aarch64-linux-stable)	1m 12s
Test (riscv64-linux-stable)	1m 0s
Test (s390x-linux-stable)	1m 29s
Test (powerpc64le-linux-stable)	1m 3s
Test (arm-linux-stable)	1m 47s
Test (ubuntu-1.48)	4m 14s
Test (i686-linux-1.48)	5m 2s
Test (aarch64-linux-1.48)	6m 12s
Test (riscv64-linux-1.48)	4m 45s
Test (s390x-linux-1.48)	5m 0s
Test (powerpc64le-linux-1.48)	4m 47s
Test (arm-linux-1.48)	5m 8s
Test (macos-latest)	1m 9s
Test (macos-11)	53s
Test (windows)	1m 4s
Test (windows-2019)	1m 10s
	1h 37m 16s

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