[MacPorts] #64939: Add muniversal PortGroup to libusb

[MacPorts]

#64939: Add muniversal PortGroup to libusb
-------------------------------------+--------------------
 Reporter:  barracuda156             |      Owner:  (none)
     Type:  defect                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.7.2
 Keywords:  powerpc, leopard, ppc64  |       Port:  libusb
-------------------------------------+--------------------
 Otherwise `+universal` gets ignored on Leopard. With `muniversal 1.0`
 being added, the port builds:

 {{{
 36-109:~ svacchanda$ port -v installed libusb
 The following ports are currently installed:
   libusb @1.0.23_0+universal requested_variants='+universal'
 platform='darwin 9' archs='ppc ppc64' date='2022-02-13T13:28:21+0800'
   libusb @1.0.25_0 requested_variants='' platform='darwin 9' archs='ppc'
 date='2022-04-06T00:43:50+0800'
   libusb @1.0.25_0+universal (active) requested_variants='+universal'
 platform='darwin 9' archs='ppc ppc64' date='2022-04-06T00:50:47+0800'
 }}}

 P. S. If anyone will test this on PowerPC, you will likely also need to
 add a pragma patch: https://trac.macports.org/ticket/64408

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Ticket URL: <https://trac.macports.org/ticket/64939>
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