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arm: use defined() for defines which are not guaranteed to be defined

--- a/src/arm/cpu.c

+++ b/src/arm/cpu.c

@@ -29,7 +29,7 @@

 #include "src/arm/cpu.h"

-#if HAVE_GETAUXVAL

+#if defined(HAVE_GETAUXVAL)

 #include <sys/auxv.h>

 #if ARCH_AARCH64

@@ -71,12 +71,12 @@

 unsigned dav1d_get_cpu_flags_arm(void) {

     unsigned flags = 0;

-#if HAVE_GETAUXVAL

+#if defined(HAVE_GETAUXVAL)

     unsigned long hw_cap = getauxval(AT_HWCAP);

     flags |= (hw_cap & NEON_HWCAP) ? DAV1D_ARM_CPU_FLAG_NEON : 0;

 #elif defined(__ANDROID__)

     flags |= parse_proc_cpuinfo("neon") ? DAV1D_ARM_CPU_FLAG_NEON : 0;

-#elif __APPLE__

+#elif defined(__APPLE__)

     flags |= DAV1D_ARM_CPU_FLAG_NEON;

 #elif defined(_WIN32)

     flags |= DAV1D_ARM_CPU_FLAG_NEON;