Pullup ticket #4328 - requested by bouyer
graphics/glew: build fix

Revisions pulled up:
- graphics/glew/Makefile                                        1.17

---
   Module Name:	pkgsrc
   Committed By:	bouyer
   Date:		Sun Feb 16 22:45:54 UTC 2014

   Modified Files:
   	pkgsrc/graphics/glew: Makefile

   Log Message:
   For some reason NetBSD is identified as 'netbsdelf' here.
   Add a symlink from Makefile.netbsdelf to Makefile.netbsd to that
   the package can build.
Pullup ticket #4328.