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

[laffer1 at midnightbsd.org]

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

Modified Files:
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    mports/graphics/netpbm:
        Makefile (r1.6 -> r1.7)
        (http://cvsweb.midnightbsd.org/mports/graphics/netpbm/Makefile?r1=1.6&r2=1.7)