Revert unnecessary compatibility change in StdioFileReader.

src/draco/io/stdio_file_reader.cc

@@ -11,7 +11,6 @@
 #include <io.h>
 #endif
 
-#include "draco/draco_features.h"
 #include "draco/io/file_reader_factory.h"
 
 namespace draco {
@@ -47,11 +46,7 @@ std::unique_ptr<FileReaderInterface> StdioFileReader::Open(
     return nullptr;
   }
 
-#ifndef DRACO_OLD_GCC
   return file;
-#else
-  return std::move(file);
-#endif
 }
 
 bool StdioFileReader::ReadFileToBuffer(std::vector<char> *buffer) {