[Bug 209371] comms/svxlink: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209371

            Bug ID: 209371
           Summary: comms/svxlink: 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: hamradio at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: hamradio at FreeBSD.org
             Flags: maintainer-feedback?(hamradio at FreeBSD.org)

Created attachment 170105
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170105&action=edit
Fix type for abs() call in comms/svxlink

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

/wrkdirs/usr/ports/comms/svxlink/work/svxlink-15.11/src/async/audio/AsyncAudioDeviceAlsa.cpp:551:7:
error: call to 'abs' is ambiguous
  if (::abs(real_rate - sample_rate) > 100)
      ^~~~~

This is because abs() is being called with an unsigned argument.  Fix this by
casting 'real_rate' to int, since it was assigned from 'sample_rate' anyhow.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-05-01_10h29m48s/logs/errors/svxlink-15.11.log

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