Remove warning about M_PIf redefinition (#490) #29

Job	Run time
build-native-gcc	3m 22s
build-native-llvm	3m 39s
test-native-gcc	10m 39s
build-aarch64-gcc	3m 42s
test-native-llvm	9m 40s
build-aarch64-llvm	7m 6s
build-armhf-gcc	2m 36s
build-armhf-llvm	2m 48s
build-ppc64el-gcc	2m 48s
build-ppc64el-llvm	2m 40s
build-s390x-gcc	4m 56s
build-s390x-llvm	5m 0s
build-riscv64-llvm	4m 44s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	17m 9s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	25m 36s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	29m 12s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	31m 53s
test-armhf-gcc (qemu_cpu: "max")	15m 36s
test-armhf-llvm (qemu_cpu: "max")	14m 32s
test-ppc64el-gcc (qemu_cpu: "power10")	27m 48s
test-ppc64el-llvm (qemu_cpu: "power10")	24m 6s
test-s390x-gcc (qemu_cpu: "")	19m 46s
test-s390x-llvm (qemu_cpu: "")	18m 21s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	7m 20s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	13m 51s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	21m 25s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	34m 14s
	6h 4m 29s

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