Better detection of available features on RISCV (#289) #107

Job	Run time
build-test-on-aarch64	1m 37s
build-test-on-arm32	2m 51s
build-test-on-loongarch64	2m 13s
build-test-on-armt2	3m 10s
build-test-on-riscv32	2m 42s
build-test-on-riscv32-extensions	2m 19s
build-test-on-riscv64	2m 21s
build-test-on-riscv64-extensions	2m 15s
build-test-on-x64	19s
build-test-on-s390x	2m 49s
build-test-on-x86	21s
	22m 57s

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