[MacPorts] #45711: libxml2-2.9.2_0 links shared libs with -flat_namespace on Yosemite

[MacPorts]

#45711: libxml2-2.9.2_0 links shared libs with -flat_namespace on Yosemite
------------------------+--------------------------------
 Reporter:  jhowarth@…  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.2
 Keywords:              |       Port:  libxml2
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 % otool -hv /opt/local/lib/libxml2.2.dylib
 /opt/local/lib/libxml2.2.dylib:
 Mach header
       magic cputype cpusubtype  caps    filetype ncmds sizeofcmds
 flags
 MH_MAGIC_64  X86_64        ALL  0x00       DYLIB    17       1872 DYLDLINK
 NO_REEXPORTED_DYLIBS

 reveals that libxml2-2.9.2_0 built on Yosemite is linking its shared
 libraries with "-flat_namespace" as seen from the missing TWOLEVEL flag
 expected from "-undefined dynamic_lookup".

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Ticket URL: <https://trac.macports.org/ticket/45711>
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