Allow build dft on MinGW #171

Job	Run time
build-native-gcc	3m 19s
build-native-llvm	4m 20s
test-native-gcc	10m 4s
build-aarch64-gcc	7m 14s
build-aarch64-llvm	2m 55s
build-armhf-gcc	2m 33s
test-native-llvm	8m 23s
build-armhf-llvm	1m 41s
build-ppc64el-gcc	2m 38s
build-ppc64el-llvm	5m 19s
build-s390x-gcc	2m 31s
build-s390x-llvm	2m 40s
build-riscv64-llvm	3m 56s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	18m 24s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	23m 22s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	29m 30s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	34m 23s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	19m 10s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	22m 5s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	28m 55s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	29m 39s
test-armhf-gcc (qemu_cpu: "max")	17m 32s
test-armhf-llvm (qemu_cpu: "max")	13m 22s
test-ppc64el-gcc (qemu_cpu: "power10")	26m 46s
test-ppc64el-llvm (qemu_cpu: "power10")	28m 10s
test-s390x-gcc (qemu_cpu: "")	20m 18s
test-s390x-llvm (qemu_cpu: "")	18m 36s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 28s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	29m 55s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	44m 2s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	59m 10s
	8h 53m 20s

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