memory: AlignedAlloc: fallback to aligned_alloc()

When compiling with clang++, __STDC_VERSION__ is not defined (obviously
as clang++ is not a C compiler). Because of this, check if compiling
with MSVC and fallback to the Linux implementation. If the latter is not
supported, compilation will fail, as it previously would have with the

src/xenia/base/memory.h

@@ -67,25 +67,21 @@ bool Protect(void* base_address, size_t length, PageAccess access,
 // The memory must be freed with AlignedFree.
 template <typename T>
 inline T* AlignedAlloc(size_t alignment) {
-#if __STDC_VERSION__ >= 201112L
-  return reinterpret_cast<T*>(aligned_alloc(alignment, sizeof(T)));
-#elif XE_COMPILER_MSVC
+#if XE_COMPILER_MSVC
   return reinterpret_cast<T*>(_aligned_malloc(sizeof(T), alignment));
 #else
-#error No aligned alloc.
-#endif  // __STDC_VERSION__ >= 201112L
+  return reinterpret_cast<T*>(aligned_alloc(alignment, sizeof(T)));
+#endif  // XE_COMPILER_MSVC
 }
 
 // Frees memory previously allocated with AlignedAlloc.
 template <typename T>
 void AlignedFree(T* ptr) {
-#if __STDC_VERSION__ >= 201112L
-  free(ptr);
-#elif XE_COMPILER_MSVC
+#if XE_COMPILER_MSVC
   _aligned_free(ptr);
 #else
-#error No aligned alloc.
-#endif  // __STDC_VERSION__ >= 201112L
+  free(ptr);
+#endif  // XE_COMPILER_MSVC
 }
 
 typedef void* FileMappingHandle;