[Bug 209694] x11-toolkits/wxgtk30: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209694

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dim
Date: Mon May 23 16:25:21 UTC 2016
New revision: 415729
URL: https://svnweb.freebsd.org/changeset/ports/415729

Log:
  During the exp-run in bug 208158, it was found that x11-toolkits/wxgtk30
  gives errors with libc++ 3.8.0:

  ./src/stc/scintilla/src/Editor.cxx:5844:6: error: call to 'abs' is ambiguous
          if (abs(pt1.x - pt2.x) > 3)
              ^~~

  This is because pt1.x and pt2.x are float values, but <cmath> is not
  included, and abs() for float values comes from that header.  Fix it by
  including <cmath>.

  Approved by:  portmaster at bsdforge.com (maintainer)
  Approved by:  vlad-fbsd at acheronmedia.com (maintainer)
  PR:           209694
  MFH:          2016Q2

Changes:
  head/x11-toolkits/wxgtk30/files/patch-src_stc_scintilla_src_Editor.cxx

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