[MacPorts] #46833: glpng fails to build due to macro conflict with libpng

[MacPorts]

#46833: glpng fails to build due to macro conflict with libpng
------------------------+--------------------------
 Reporter:  jeremyhu@…  |      Owner:  ryandesign@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.3
 Keywords:              |       Port:  glpng
------------------------+--------------------------
 {{{
 /usr/bin/clang -O0 -g3 -arch x86_64 -I../include -I/opt/local/include -c
 -o libglpng.o glpng.c
 In file included from glpng.c:32:
 /opt/local/include/png.h:915:9: error: expected identifier or '('
 typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp,
 png_const_charp));
         ^
 ../include/GL/glpng.h:60:23: note: expanded from macro 'PNG_CALLBACK'
 #define PNG_CALLBACK  -3 /* Call the callback function to generate alpha
 */
                       ^
 In file included from glpng.c:32:
 }}}

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Ticket URL: <https://trac.macports.org/ticket/46833>
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