Fix: Windows does not define __ARM_NEON (#363)

* Windows does not define __ARM_NEON

However, Windows requires NEON to work, so assume it is there if build with MSVC

* Clarify NEON availability in MSVC targeting arm64

* Fix Formatting

include/cpu_features_macros.h

@@ -234,13 +234,14 @@
 
 #endif  // defined(CPU_FEATURES_ARCH_X86)
 
-#if defined(CPU_FEATURES_ARCH_ANY_ARM)
-#if defined(__ARM_NEON)
+// Note: MSVC targeting ARM does not define `__ARM_NEON` but Windows on ARM
+// requires it. In that case we force NEON detection.
+#if defined(__ARM_NEON) || \
+    (defined(CPU_FEATURES_COMPILER_MSC) && defined(CPU_FEATURES_ARCH_ANY_ARM))
 #define CPU_FEATURES_COMPILED_ANY_ARM_NEON 1
 #else
 #define CPU_FEATURES_COMPILED_ANY_ARM_NEON 0
-#endif  //  defined(__ARM_NEON)
-#endif  //  defined(CPU_FEATURES_ARCH_ANY_ARM)
+#endif
 
 #if defined(CPU_FEATURES_ARCH_MIPS)
 #if defined(__mips_msa)