[MacPorts] #65667: cmake portgroup: Unable to use backslash in configure flags

[MacPorts]

#65667: cmake portgroup: Unable to use backslash in configure flags
-------------------------+--------------------
  Reporter:  mohd-akram  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:              |
-------------------------+--------------------

Comment (by jmroot):

 I have no idea why the portgroup is doing things the way it does (using
 `split` on something that is already a list) rather than
 {{{
 configure.cflags-append {*}${configure.cppflags}
 configure.cxxflags-append {*}${configure.cppflags}
 configure.objcflags-append {*}${configure.cppflags}
 configure.objcxxflags-append {*}${configure.cppflags}
 configure.cppflags
 }}}

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Ticket URL: <https://trac.macports.org/ticket/65667#comment:2>
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