ports/141855: Bump graphics/pngcrush to latest 1.7.6

[Joseph S. Atkinson]

>Number:         141855
>Category:       ports
>Synopsis:       Bump graphics/pngcrush to latest 1.7.6
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          maintainer-update
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 21 21:20:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Joseph S. Atkinson
>Release:        
>Organization:
>Environment:
>Description:
1.7.6 is mostly code style cleanups and some sanity checking. There is one new feature, but it can only be used with bleeding edge libpng, so it is not enabled here.
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: