[MacPorts] #40768: saga: use the wxWidgets PortGroup

[MacPorts]

#40768: saga: use the wxWidgets PortGroup
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 Reporter:  mojca@…      |      Owner:  vince@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  saga
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 I would like to request the usage of the `wxWidgets PortGroup` for `saga`.

 Additionally please submit an upstream request to use `wxwin.m4` to
 determine the right `wx-config` rather than "hardcoding" it.

 The patch also adds a few extra spaces, patches `Makefile.am` instead of
 `Makefile` (if you ever stop running autofoo tools, you might need to
 change that back to fixing `Makefile`, but let's hope that the upstream
 will properly fix the functionality by then).

 There is no need to hardcode wxWidgets version and there is no need to add
 additional include flags. Those were only needed because `wx-config` was
 not found at first.

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Ticket URL: <https://trac.macports.org/ticket/40768>
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