Revert s/__ARM_NEON/__ARM_NEON__/g (#361)

Author: gchatelet

include/cpu_features_macros.h

@@ -235,11 +235,11 @@
 #endif  // defined(CPU_FEATURES_ARCH_X86)
 
 #if defined(CPU_FEATURES_ARCH_ANY_ARM)
-#if defined(__ARM_NEON__)
+#if defined(__ARM_NEON)
 #define CPU_FEATURES_COMPILED_ANY_ARM_NEON 1
 #else
 #define CPU_FEATURES_COMPILED_ANY_ARM_NEON 0
-#endif  //  defined(__ARM_NEON__)
+#endif  //  defined(__ARM_NEON)
 #endif  //  defined(CPU_FEATURES_ARCH_ANY_ARM)
 
 #if defined(CPU_FEATURES_ARCH_MIPS)