[Bug 209652] graphics/embree: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209652

            Bug ID: 209652
           Summary: graphics/embree: 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: danfe at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(danfe at FreeBSD.org)
          Assignee: danfe at FreeBSD.org

Created attachment 170491
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170491&action=edit
Disable some overloaded math functions for libc++ 3.8.0 and higher

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

/wrkdirs/usr/ports/graphics/embree/work/embree-2.7.0/tutorials/common/tutorial/tutorial_device.cpp:270:39:
error: call to 'abs' is ambiguous
  Vec3fa col = Vec3fa(min(1.f,.3f+.8f*abs(dot(Ng,normalize(ray.dir)))));
                                      ^~~

This is because embree defines its own version of a number of <cmath>
functions, which cause the ambiguity.  These functions are only declared in
<cmath> for libc++ 3.8.0 and later, so fix it by disabling the custom functions
for those versions of libc++.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-05-01_10h29m48s/logs/errors/embree-2.7.0_1.log

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