[MacPorts] #47907: libvpx: update to 1.4.0

[MacPorts]

#47907: libvpx: update to 1.4.0
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  Reporter:  ryandesign@…  |      Owner:  devans@…
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  libvpx        |
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Comment (by ryandesign@…):

 Replying to [comment:3 ryandesign@…]:
 > It seems it has decided to build universal, even though I did not select
 that variant [...]. Maybe this is a reason why we were specifying the
 target before.

 Oh yeah, there's even a comment in the portfile about that.

 I've attached a [attachment:libvpx-1.4.0-ryandesign.diff​ revised update
 proposal] bringing back the commented-out code for specifying the target.
 I cleaned up the code a bit and fixed it to use the right target OS
 version based on the deployment target configured in macports.conf. It
 builds for me on x86_64 Yosemite (universal i386 and x86_64), and i386
 Snow Leopard (non-universal i386, and universal i386 x86_64 ppc). I use
 `--force-target` instead of `--target` to avoid complaints about unknown
 target ppc32-darwin10-gcc.

 I didn't yet look closely at the patchfiles you're no longer using...

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Ticket URL: <https://trac.macports.org/ticket/47907#comment:4>
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