Configure.cmake: improve RVV1 check #287

Job	Run time
build-native-ubuntu-24.04-gcc	3m 45s
build-native-ubuntu-24.04-llvm	3m 31s
build-native-ah-ubuntu_22_04-c7g_2x-50-gcc	2m 18s
build-native-ah-ubuntu_22_04-c7g_2x-50-llvm	2m 16s
test-native-ubuntu-24.04-gcc	8m 18s
build-armhf-gcc	1m 27s
test-native-ubuntu-24.04-llvm	8m 16s
build-armhf-llvm	1m 50s
test-native-ah-ubuntu_22_04-c7g_2x-50-gcc	3m 18s
build-ppc64el-gcc	2m 51s
test-native-ah-ubuntu_22_04-c7g_2x-50-llvm	3m 0s
build-ppc64el-llvm	2m 27s
build-s390x-gcc	2m 1s
build-s390x-llvm	2m 20s
build-riscv64-gcc	4m 9s
build-riscv64-llvm	2m 46s
test-${{ matrix.arch }}-${{ matrix.compiler }} (qemu_cpu: "${{ matrix.qemu_cpu }}")	0s
	54m 33s

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