Rename some global variables to avoid clashes #39

Job	Run time
build-native-gcc	3m 18s
build-native-llvm	3m 48s
test-native-gcc	10m 35s
build-aarch64-gcc	7m 18s
test-native-llvm	9m 4s
build-aarch64-llvm	5m 11s
build-armhf-gcc	4m 30s
build-armhf-llvm	4m 38s
build-ppc64el-gcc	8m 54s
build-ppc64el-llvm	8m 58s
build-s390x-gcc	3m 52s
build-s390x-llvm	7m 11s
build-riscv64-llvm	6m 12s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	20m 34s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	22m 12s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	25m 22s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	33m 28s
test-armhf-gcc (qemu_cpu: "max")	14m 24s
test-armhf-llvm (qemu_cpu: "max")	15m 32s
test-ppc64el-gcc (qemu_cpu: "power10")	27m 54s
test-ppc64el-llvm (qemu_cpu: "power10")	25m 16s
test-s390x-gcc (qemu_cpu: "")	19m 37s
test-s390x-llvm (qemu_cpu: "")	18m 20s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	3m 54s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	13m 50s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	22m 43s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	32m 23s
	6h 18m 58s

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