[Bug 193282] New: multimedia/plexhometheater runtime error avcodec-53-x86_64-freebsd.so: Undefined symbol "ff_h264dsp_init_x86"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193282

            Bug ID: 193282
           Summary: multimedia/plexhometheater runtime error
                    avcodec-53-x86_64-freebsd.so: Undefined symbol
                    "ff_h264dsp_init_x86"
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: woodsb02 at gmail.com

Plexhometheater is unable to play videos, with some of the following error
messages appearing in the logs depending on the codec of the video being
played.

ERROR: Unable to load
/usr/local/lib/plexhometheater/system/players/dvdplayer/avcodec-53-x86-freebsd.so,
reason: /usr/local/bin/system/players/dvdplayer/avcodec-53-x86_64-freebsd.so:
Undefined symbol "ff_h264dsp_init_x86"

ERROR: Unable to load
/usr/local/lib/plexhometheater/system/players/dvdplayer/avcodec-53-x86-freebsd.so,
reason: /usr/local/bin/system/players/dvdplayer/avcodec-53-x86_64-freebsd.so:
Undefined symbol "ff_mlp_init_x86"

This is similar to PR181964 filed previously for multimedia/gstreamer-ffmpeg
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181964

This issue is caused as during port build some variables not defined in
MAKE_ENV/MAKE_ARGS are leaked to do-build target via .MAKEFLAGS rule in
bsd.port.mk. According to make(1) man page variable assignments in MAKEFLAGS
are treated as those on command line which means they override assignments in
Makefiles.

Unfortunately, this breaks building arch-specific code for libavcodec as
$(ARCH) in config.mak is no longer honored.

Fix: Rename the variable from ARCH to FFMPEG_ARCH, as is done in
multimedia/ffmpeg.

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