openjpeg: Remove unneeded non-standard code.

third_party/libopenjpeg20/opj_includes.h

 /*
  * The copyright in this software is being made available under the 2-clauses 
  * BSD License, included below. This software may be subject to other third 
  * party and contributor rights, including patent rights, and no such rights
  * are granted under this license.
  *
  * Copyright (c) 2005, Herve Drolon, FreeImage Team
  * Copyright (c) 2008, 2011-2012, Centre National d'Etudes Spatiales (CNES), FR 
  * Copyright (c) 2012, CS Systemes d'Information, France
  * All rights reserved.
@@ skipping 84 matching lines @@
  ==========================================================
  */
 #include "openjpeg.h"
 
 /*
  ==========================================================
    OpenJPEG modules
  ==========================================================
 */
 
-/* Ignore GCC attributes if this is not GCC */
-#ifndef __GNUC__
-        #define __attribute__(x) /* __attribute__(x) */
-#endif
-
-
 /* Are restricted pointers available? (C99) */
 #if (__STDC_VERSION__ != 199901L)
         /* Not a C99 compiler */
         #ifdef __GNUC__
                 #define restrict __restrict__
         #else
                 #define restrict /* restrict */
         #endif
 #endif
 
@@ skipping 86 matching lines @@
 #ifdef USE_JPWL
 #include "openjpwl/jpwl.h"
 #endif /* USE_JPWL */
 /* <<JPWL */
 
 /* V2 */
 #include "opj_codec.h"
 
 
 #endif /* OPJ_INCLUDES_H */