Fix usage of SK_BUILD_* defines.

src/core/SkUtilsArm.cpp

 
 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkUtilsArm.h"
 
 #if SK_ARM_NEON_IS_DYNAMIC
 
 #include <unistd.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <string.h>
 #include <pthread.h>
 
-#if SK_BUILD_FOR_ANDROID
+#if defined(SK_BUILD_FOR_ANDROID)
 #  include <cpu-features.h>
 #endif
 
 // A function used to determine at runtime if the target CPU supports
 // the ARM NEON instruction set. This implementation is Linux-specific.
 static bool sk_cpu_arm_check_neon(void) {
     // If we fail any of the following, assume we don't have NEON instructions
     // This allows us to return immediately in case of error.
     bool result = false;
 
@@ skipping 107 matching lines @@
 void sk_cpu_arm_probe_features(void) {
     sHasArmNeon = sk_cpu_arm_check_neon();
 }
 
 bool sk_cpu_arm_has_neon(void) {
     pthread_once(&sOnce, sk_cpu_arm_probe_features);
     return sHasArmNeon;
 }
 
 #endif // SK_ARM_NEON_IS_DYNAMIC