[Midnightbsd-cvs] mports: Makefile: Fix the shared lib version for png

[vganji at midnightbsd.org]

Log Message:
-----------
Fix the shared lib version for png

Modified Files:
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    mports/print/cups-base:
        Makefile (r1.24 -> r1.25)
        (http://cvsweb.midnightbsd.org/mports/print/cups-base/Makefile?r1=1.24&r2=1.25)