[MacPorts] #50768: wxWidgets: create a new port to hold common files

[MacPorts]

#50768: wxWidgets: create a new port to hold common files
-------------------------+-------------------------------------------------
 Reporter:  mojca@…      |      Owner:  mojca@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  wxWidgets-2.8 wxWidgets-3.0
                         |  wxWidgets_select
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 I'm attaching a patch that fetches the following files from the latest
 release:
 {{{
 share/aclocal/wxwin.m4
 share/bakefile/presets/wx.bkl
 share/bakefile/presets/wx_presets.py
 share/bakefile/presets/wx_unix.bkl
 share/bakefile/presets/wx_win32.bkl
 share/bakefile/presets/wx_xrc.bkl
 }}}
 and installs them straight to `${prefix}`, avoiding the need for `port
 select` to handle those six files. I don't know what the last five are,
 but the first one:
 * certainly works with any wxWidgets version
 * it is often needed (some software packages need it for running
 `autoconf` if they don't ship a local copy)
 * causes problems with `autoconf` due to a bug in `port select` (#47755)

 The step that is still missing is some cleanup of leftovers in
 preactivation step.

 I would like to request some testing and feedback before committing the
 files.

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Ticket URL: <https://trac.macports.org/ticket/50768>
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