[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

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: truckman
Date: Tue Jun  7 04:14:38 UTC 2016
New revision: 416493
URL: https://svnweb.freebsd.org/changeset/ports/416493

Log:
  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:

  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.  This
  mimics what happens with older libraries where the only version of
  abs() was the one in <stdlib.h>, which is prototyped:
        int abs(int)
  The expression used in ConnRef::generatePath() is not strictly correct
  because it depends on details of integer overflow that are undefined
  by the C++ standard.

  PR:           209675
  Submitted by: dim

Changes:
  head/graphics/inkscape/files/
  head/graphics/inkscape/files/patch-src_libavoid_connector.cpp
  head/graphics/inkscape/files/patch-src_ui_tools_flood-tool.cpp

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