Log Message:
The SIGSEGV worked around by patch-src_glu_libtess_sweep.c are in fact
due to a wrong value GLU_TESS_MAX_COORD on NetBSD. See
http://mail-index.netbsd.org/tech-x11/2016/05/25/msg001733.html

Work around this by reordering -I flags so that the local GL/glu.h is used
before the one from the buildlink directory.

While there change build type from debug to release.
Bump PKGREVISION.