Call fseek64 only with MSVC

Signed-off-by: Osyotr <Osyotr@users.noreply.github.com>

coding/internal/file_data.cpp

@@ -36,8 +36,11 @@ FileData::FileData(string const & fileName, Op op)
   m_File = fopen(fileName.c_str(), modes[op]);
   if (m_File)
   {
+#if defined(_MSC_VER)
+    // Move file pointer to the end of the file to make it consistent with other platforms
     if (op == OP_APPEND)
       fseek64(m_File, 0, SEEK_END);
+#endif
     return;
   }