BaseTools/CommonLib: Replace aligned_alloc with posix_memalign

BaseTools/Source/C/Common/CommonLib.c

@@ -502,7 +502,15 @@ InternalAlignedAlloc (
   )
 {
 #ifndef _WIN32
-  return aligned_alloc (Alignment, Size);
+  int   Result;
+  void  *Buffer;
+
+  Result = posix_memalign (&Buffer, Alignment, Size);
+  if (Result != 0) {
+    return NULL;
+  }
+
+  return Buffer;
 #else
   return _aligned_malloc (Size, Alignment);
 #endif