[Bug 209675] graphics/inkscape: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209675

            Bug ID: 209675
           Summary: graphics/inkscape: 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: gnome at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(gnome at FreeBSD.org)
          Assignee: gnome at FreeBSD.org

Created attachment 170521
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170521&action=edit
Fix type for abs() calls in graphics/inkscape

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

libavoid/connector.cpp:888:29: error: call to 'abs' is ambiguous
                COLA_ASSERT(abs(i->pathNext->id.objID - i->id.objID) != 2);
                            ^~~

This is because abs() is called with unsigned arguments.  Fix it by casting the
arguments to the appropriate signed types.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-05-01_10h29m48s/logs/errors/inkscape-0.91_6.log

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