[MacPorts] #69515: groff depends on m4 which isn't provided with commandlineTools 15.3

[MacPorts]

#69515: groff depends on m4 which isn't provided with commandlineTools 15.3
---------------------------+--------------------
 Reporter:  MStraeten      |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.9.1
 Keywords:  m4 dependency  |       Port:  groff
---------------------------+--------------------
 similar to #69493
 groff asks for installation of commandlinetools to get m4 support.
 the fix described in https://github.com/macports/macports-ports/pull/22984
 i.e. adding port:m4 to depends_lib-append and
 configure.env           M4=${prefix}/bin/gm4

 seems to be a workaround for the issue

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Ticket URL: <https://trac.macports.org/ticket/69515>
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