devel/libmatchbox does not build with recent png

[Erik Bertelsen <bertelsen.erik%gmail.com@localhost>]

Looks like more png update fall-out:

if /bin/sh ../libtool --tag=CC --mode=compile cc -DHAVE_CONFIG_H  -I. -I. -I..   -I/usr/pkg/include -I/usr/include -I/usr/X11R7/include -I/usr/X11R7/include/freetype2  -g -Wall -fno-strict-aliasing  -D_REENTRANT -I/usr/X11R7/include -I/usr/X11R7/include/freetype2      -DDATADIR=\"/usr/pkg/share\" -O2 -I/usr/pkg/include -I/usr/include -I/usr/X11R7/include -I/usr/X11R7/include/freetype2 -MT mbpixbuf.lo -MD -MP -MF ".deps/mbpixbuf.Tpo" -c -o mbpixbuf.lo mbpixbuf.c;  then mv -f ".deps/mbpixbuf.Tpo" ".deps/mbpixbuf.Plo"; else rm -f ".deps/mbpixbuf.Tpo"; exit 1; fi
libtool: compile:  cc -DHAVE_CONFIG_H -I. -I.. -I/home/NetBSD/wrkobj/devel/libmatchbox/work.i386/.buildlink/include -I/home/NetBSD/wrkobj/devel/libmatchbox/work.i386/.x11-buildlink/include -I/home/NetBSD/wrkobj/devel/libmatchbox/work.i386/.x11-buildlink/include/freetype2 -g -Wall -fno-strict-aliasing -D_REENTRANT -DDATADIR=\"/usr/pkg/share\" -O2 -MT mbpixbuf.lo -MD -MP -MF .deps/mbpixbuf.Tpo -c mbpixbuf.c  -fPIC -DPIC -o .libs/mbpixbuf.o
mbpixbuf.c: In function '_load_png_file':
mbpixbuf.c:250: error: dereferencing pointer to incomplete type
mbpixbuf.c:272: error: dereferencing pointer to incomplete type
mbpixbuf.c:273: error: dereferencing pointer to incomplete type
mbpixbuf.c: In function '_load_xpm_file':
mbpixbuf.c:379: warning: implicit declaration of function 'mb_want_warnings'
mbpixbuf.c: In function 'mb_pixbuf_img_fill':
mbpixbuf.c:1400: warning: value computed is not used
*** Error code 1

Stop.
make: stopped in /home/NetBSD/wrkobj/devel/libmatchbox/work.i386/libmatchbox-1.9/libmb
*** Error code 1

Stop.
make: stopped in /home/NetBSD/wrkobj/devel/libmatchbox/work.i386/libmatchbox-1.9
*** Error code 1

Stop.
make: stopped in /home/NetBSD/wrkobj/devel/libmatchbox/work.i386/libmatchbox-1.9
*** Error code 1

Stop.
make: stopped in /home/NetBSD/pkgsrc/devel/libmatchbox
*** Error code 1

Stop.
make: stopped in /home/NetBSD/pkgsrc/devel/libmatchbox
*** Error code 1

Stop.
make: stopped in /home/NetBSD/pkgsrc/devel/libmatchbox

Output is from a clean build of the package based on pkgsrc sources af of a few hours ago

regards
- Erik