Fix RVV intrinsic version detection. #135

Job	Run time
build-native-gcc	3m 17s
build-native-llvm	4m 5s
build-aarch64-gcc	4m 5s
test-native-gcc	8m 49s
build-aarch64-llvm	2m 56s
test-native-llvm	7m 28s
build-armhf-gcc	1m 44s
build-armhf-llvm	1m 49s
build-ppc64el-gcc	3m 13s
build-ppc64el-llvm	3m 26s
build-s390x-gcc	2m 31s
build-s390x-llvm	2m 36s
build-riscv64-llvm	3m 18s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	20m 45s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	23m 9s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	25m 48s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	29m 42s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	19m 48s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	21m 9s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	29m 21s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	30m 7s
test-armhf-gcc (qemu_cpu: "max")	16m 45s
test-armhf-llvm (qemu_cpu: "max")	15m 46s
test-ppc64el-gcc (qemu_cpu: "power10")	26m 36s
test-ppc64el-llvm (qemu_cpu: "power10")	24m 5s
test-s390x-gcc (qemu_cpu: "")	22m 55s
test-s390x-llvm (qemu_cpu: "")	18m 7s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 24s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	29m 59s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	39m 43s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	59m 2s
	8h 34m 28s

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