[Midnightbsd-cvs] mports: Makefile: png update

[laffer1 at midnightbsd.org]

Log Message:
-----------
png update

Modified Files:
--------------
    mports/x11/slim:
        Makefile (r1.17 -> r1.18)
        (http://cvsweb.midnightbsd.org/mports/x11/slim/Makefile?r1=1.17&r2=1.18)