[MacPorts] #53307: Update libvpx to v1.6.1

[MacPorts]

#53307: Update libvpx to v1.6.1
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 Reporter:  johannkoenig  |      Owner:
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:
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 libvpx has released a new version:
 https://groups.google.com/a/webmproject.org/d/msg/codec-
 devel/Vt6c2Z96cWI/aTYeP5y6BwAJ

 https://chromium.googlesource.com/webm/libvpx/+archive/v1.6.1.tar.gz

 Although PPC support was removed in v1.5.0, using --target=generic-gnu a
 C-only build can be created. Since versions before v1.5.0 didn't have any
 optimizations for PPC, it wouldn't represent a performance regression. I
 don't know how useful that library would be to people though.

 The configure script in macports was massively simplified for the last
 update:
 https://github.com/macports/macports-
 ports/blob/master/multimedia/libvpx/files/patch-build-make-
 configure.sh.diff

 Are the -mmacosx-version-min/max flags no longer useful? We'd be happy to
 take that patch upstream if that is the case.

 The port warns against support for 10.5:
 https://github.com/macports/macports-
 ports/commit/026309f6708aa8ea7846b44b450c1484dac9e0ed#diff-
 37bbebaa31f457b80e2845b095b284bd

 Is this because of an outdated compiler? Otherwise I'm not aware of any
 reason the library would not run on 10.5. Similar to PPC, --target
 =generic-gnu could provide a workaround but it would still be very slow.

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Ticket URL: <https://trac.macports.org/ticket/53307>
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