[MacPorts] #65179: py-libxml2, py-Pillow, py-gdbm: need to either blacklist gcc-4* or patch out -Wno-unused-result

[MacPorts]

#65179: py-libxml2, py-Pillow, py-gdbm: need to either blacklist gcc-4* or patch
out -Wno-unused-result
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  MarcusCalhoun-Lopez
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:  powerpc, leopard, snowleopard,
      Port:  py-libxml2  |  rosetta
  py-Pillow              |
-------------------------+-------------------------------------------------

Comment (by barracuda156):

 Replying to [comment:6 reneeotten]:
 > `py-cython` has blacklisted old gcc version in
 [changeset:0476e42f1442d300d34fa25a75516efe27a17ea0/macports-ports this
 commit]

 The problem still exists for `py-libxml2` and few other ports.

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Ticket URL: <https://trac.macports.org/ticket/65179#comment:9>
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