[Bug 243659] multimedia/wlrobs: fix build on powerpc64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243659

            Bug ID: 243659
           Summary: multimedia/wlrobs: fix build on powerpc64
           Product: Ports & Packages
           Version: Latest
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org
                CC: powerpc at FreeBSD.org
                CC: powerpc at FreeBSD.org

Created attachment 211116
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211116&action=edit
patch

This port tries to use SSE and fails on powerpc64. Use GCC's translation layer
to AltiVec to fix it:
In file included from /usr/local/include/obs/graphics/vec4.h:21,
                 from /usr/local/include/obs/graphics/vec3.h:21,
                 from /usr/local/include/obs/obs.h:26,
                 from /usr/local/include/obs/obs-module.h:20,
                 from ../inc/scpy_source.h:29,
                 from ../src/scpy_source.c:18:
/usr/local/lib/gcc9/gcc/powerpc64-portbld-freebsd12.1/9.2.0/include/xmmintrin.h:54:2:
error: #error "Please read comment above.  Use -DNO_WARN_X86_INTRINSICS to
disable this error."
   54 | #error "Please read comment above.  Use -DNO_WARN_X86_INTRINSICS to
disable this error."
      |  ^~~~~
In file included from
/usr/local/lib/gcc9/gcc/powerpc64-portbld-freebsd12.1/9.2.0/include/xmmintrin.h:63,
                 from /usr/local/include/obs/graphics/vec4.h:21,
                 from /usr/local/include/obs/graphics/vec3.h:21,
                 from /usr/local/include/obs/obs.h:26,
                 from /usr/local/include/obs/obs-module.h:20,
                 from ../inc/scpy_source.h:29,
                 from ../src/scpy_source.c:18:
/usr/local/lib/gcc9/gcc/powerpc64-portbld-freebsd12.1/9.2.0/include/altivec.h:34:2:
error: #error Use the "-maltivec" flag to enable PowerPC AltiVec support
   34 | #error Use the "-maltivec" flag to enable PowerPC AltiVec support
      |  ^~~~~
In file included from
/usr/local/lib/gcc9/gcc/powerpc64-portbld-freebsd12.1/9.2.0/include/xmmintrin.h:79,
                 from /usr/local/include/obs/graphics/vec4.h:21,
                 from /usr/local/include/obs/graphics/vec3.h:21,
                 from /usr/local/include/obs/obs.h:26,
                 from /usr/local/include/obs/obs-module.h:20,
                 from ../inc/scpy_source.h:29,
                 from ../src/scpy_source.c:18:

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