Log Message:
Update to pixman-0.11.4.  No ChangeLog--you may check the GIT history
if you're curious.

Also (this is noted in the Makefile):

The configure script is written to fail if it detects gcc<4.0
for lack of -fvisibility=hidden. In keeping with the pkgsrc
tradition of portability, we'll opt to use libtool to export
the desired symbols, hiding the rest.

I have verified the list of visible symbols is unchanged from
the "factory" build.