[Midnightbsd-cvs] mports: Makefile: bump for png

[laffer1 at midnightbsd.org]

Log Message:
-----------
bump for png

Modified Files:
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    mports/graphics/cairo:
        Makefile (r1.18 -> r1.19)
        (http://cvsweb.midnightbsd.org/mports/graphics/cairo/Makefile?r1=1.18&r2=1.19)