[MacPorts] #57215: libnetpbm at 10.84.00 : uses strndup. Needs snowleopard_fixes 1.0

[MacPorts]

#57215: libnetpbm at 10.84.00 : uses strndup. Needs snowleopard_fixes  1.0
--------------------+------------------------
 Reporter:  kencu   |      Owner:  ryandesign
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libnetpbm
--------------------+------------------------
 <https://build.macports.org/builders/ports-10.6_x86_64_legacy-
 builder/builds/77812/steps/install-port/logs/stdio>
 {{{
 Undefined symbols:
   "_strndup", referenced from:
       _processBdfFontLine in libpbmfont2.o
       _processBdfFontLine in libpbmfont2.o
 }}}

 adding
 {{{
 PortGroup snowleopard_fixes 1.0
 }}}
 fixes build

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Ticket URL: <https://trac.macports.org/ticket/57215>
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