Add SLEEF_BUILD_SHARED_LIBS to override BUILD_SHARED_LIBS from includ… #142

Job	Run time
build-native-gcc	3m 24s
build-native-llvm	3m 50s
test-native-gcc	10m 6s
build-aarch64-gcc	5m 9s
test-native-llvm	7m 34s
build-aarch64-llvm	7m 7s
build-armhf-gcc	2m 37s
build-armhf-llvm	2m 10s
build-ppc64el-gcc	6m 39s
build-ppc64el-llvm	6m 45s
build-s390x-gcc	5m 31s
build-s390x-llvm	3m 30s
build-riscv64-llvm	2m 45s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	3m 11s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	2m 59s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	3m 11s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	3m 10s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	2m 57s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	3m 8s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	2m 57s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	3m 11s
test-armhf-gcc (qemu_cpu: "max")	3m 6s
test-armhf-llvm (qemu_cpu: "max")	3m 9s
test-ppc64el-gcc (qemu_cpu: "power10")	3m 12s
test-ppc64el-llvm (qemu_cpu: "power10")	3m 8s
test-s390x-gcc (qemu_cpu: "")	2m 57s
test-s390x-llvm (qemu_cpu: "")	3m 10s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	2m 56s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	3m 7s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	3m 8s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	3m 6s
	2h 2m 50s

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