Enable libsleefdft and libsleefquad on riscv64 #119

Job	Run time
build-native-gcc	3m 13s
build-native-llvm	4m 4s
test-native-gcc	10m 4s
build-aarch64-gcc	3m 37s
test-native-llvm	9m 38s
build-aarch64-llvm	2m 57s
build-armhf-gcc	1m 58s
build-armhf-llvm	1m 27s
build-ppc64el-gcc	2m 43s
build-ppc64el-llvm	2m 44s
build-s390x-gcc	4m 59s
build-s390x-llvm	5m 40s
build-riscv64-llvm	2m 32s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	16m 16s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	23m 10s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	29m 32s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	29m 18s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	19m 6s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	20m 35s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	28m 18s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	32m 21s
test-armhf-gcc (qemu_cpu: "max")	14m 23s
test-armhf-llvm (qemu_cpu: "max")	13m 33s
test-ppc64el-gcc (qemu_cpu: "power10")	29m 54s
test-ppc64el-llvm (qemu_cpu: "power10")	25m 24s
test-s390x-gcc (qemu_cpu: "")	19m 20s
test-s390x-llvm (qemu_cpu: "")	17m 59s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 52s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	23m 54s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	31m 22s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	45m 11s
	8h 8m 4s

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