[MacPorts] #55820: libvpx @1.7.0: vpx_dsp/x86/sad4d_avx512.c fails build El Capitan

[MacPorts]

#55820: libvpx @1.7.0: vpx_dsp/x86/sad4d_avx512.c fails build El Capitan
-----------------------+--------------------
 Reporter:  sunoterra  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.4.2
 Keywords:  elcapitan  |       Port:  libvpx
-----------------------+--------------------
 == how
 === after a tree sync
 * {{{sudo port -cfsuv upgrade outdated}}}
 === or by uninstalling gimp first
   * {{{sudo port -cfuv uninstall gimp}}}
  * then trim leaved deps
   * {{{sudo port_cutleaves}}}
  * and re-install
   * {{{sudo port -cfsuv install gimp +quartz}}}

 == error summary at log-end
 {{{
 8 warnings and 18 errors generated.
 make[1]: *** [vpx_dsp/x86/sad4d_avx512.c.o] Error 1
 make[1]: *** Waiting for unfinished jobs....
 make: *** [.DEFAULT] Error 2
 make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_sea.us.rsync.macports.org_release_tarballs_ports_multimedia_libvpx/libvpx/work/libvpx-1.7.0'
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_sea.us.rsync.macports.org_release_tarballs_ports_multimedia_libvpx/libvpx/work/libvpx-1.7.0"
 && /usr/bin/make -j4 -w verbose=1 CFLAGS_S=-fno-integrated-as
 Exit code: 2
 Error: Failed to build libvpx: command execution failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_sea.us.rsync.macports.org_release_tarballs_ports_multimedia_libvpx/libvpx/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 Error: Processing of port gimp failed
 }}}

 == full log is attached

 (i) experienced no issues compiling this on Sierra or HighSierra

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Ticket URL: <https://trac.macports.org/ticket/55820>
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