Fix all relative includes to third_party.

samples/fx_lpng/lpng_v163/pngstruct.h

 
 /* pngstruct.h - header file for PNG reference library
  *
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * Last changed in libpng 1.6.1 [March 28, 2013]
  *
  * This code is released under the libpng license.
@@ skipping 10 matching lines @@
 #ifndef PNGSTRUCT_H
 #define PNGSTRUCT_H
 /* zlib.h defines the structure z_stream, an instance of which is included
  * in this structure and is required for decompressing the LZ compressed
  * data in PNG files.
  */
 #ifndef ZLIB_CONST
    /* We must ensure that zlib uses 'const' in declarations. */
 #  define ZLIB_CONST
 #endif
-#include "../../../third_party/zlib_v128/zlib.h"
+#include "third_party/zlib_v128/zlib.h"
 #ifdef const
    /* zlib.h sometimes #defines const to nothing, undo this. */
 #  undef const
 #endif
 
 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
  * with older builds.
  */
 #if ZLIB_VERNUM < 0x1260
 #  define PNGZ_MSG_CAST(s) png_constcast(char*,s)
@@ skipping 438 matching lines @@
    void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
       png_bytep row, png_const_bytep prev_row);
 
 #ifdef PNG_READ_SUPPORTED
 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
    png_colorspace   colorspace;
 #endif
 #endif
 };
 #endif /* PNGSTRUCT_H */