[Bug 213583] multimedia/ffmpeg: enable MMX/SSE by default on i386

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213583

            Bug ID: 213583
           Summary: multimedia/ffmpeg: enable MMX/SSE by default on i386
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: multimedia at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
        Depends on: 205958
          Assignee: multimedia at FreeBSD.org
             Flags: maintainer-feedback?(multimedia at FreeBSD.org)

Created attachment 175893
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175893&action=edit
v1

With stack alignment crashes fixed SIMD should be safe to use by default given
the code is gated by CPUID check at runtime. CPUID is also used on amd64 to
enable SSE4 or AVX at runtime but we haven't seen crashes there, so there's no
corresponding compile-time options.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205958
[Bug 205958] multimedia/ffmpeg libavcodec crashes with Bus error on i386 and
beaglebone when using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX (i386)
or  ARMv6 NEON (beaglebone black)
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