[Bug 208843] graphics/cuneiform: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208843

            Bug ID: 208843
           Summary: graphics/cuneiform: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: samm at os2.kiev.ua
             Flags: maintainer-feedback?(samm at os2.kiev.ua)
                CC: samm at os2.kiev.ua

Created attachment 169380
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169380&action=edit
Fix argument type for abs() in graphics/cuneiform

During the exp-run in bug 208158, it was found that graphics/cuneiform gives
errors with libc++ 3.8.0 [1]:

/wrkdirs/usr/ports/graphics/cuneiform/work/cuneiform-linux-1.1.0/cuneiform_src/Kern/rimage/sources/main/cricontrol.cpp:597:32:
error: call to 'abs' is ambiguous
        wNewHeight = (mbMarginsFlag ? abs(mrMargins.rmBottomMarg -
mrMargins.rmTopMarg) : mpSourceDIB->GetLinesNumber());
                                      ^~~

This is because abs() is being called an unsigned argument.  Fix this by
casting the argument to the appropriate signed type.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/cuneiform-1.1.0_4.log

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