[Bug 209077] net/opal: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209077

            Bug ID: 209077
           Summary: net/opal: 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 169728
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169728&action=edit
Fix type for abs() calls in net/opal

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

../common/mpi.cxx:135:18: error: call to 'abs' is ambiguous
    distance = ( abs(MPIs[i].width  - desiredWidth ) *
                 ^~~

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

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/opal-3.10.10_9.log

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