[MacPorts] #38018: Doxygen: Prevent clang memory leak by adding back the flag reinplaced away by r101062

[MacPorts]

#38018: Doxygen: Prevent clang memory leak by adding back the flag reinplaced away
by r101062
----------------------+---------------------
  Reporter:  egall@…  |      Owner:  mmoll@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.1.3
Resolution:           |   Keywords:
      Port:  doxygen  |
----------------------+---------------------

Comment (by egall@…):

 Since my main.log got overwritten once I finally properly fixed my local
 copy of my portfile, here's some diagnostic information btw:
 {{{

 gl00b05045:~ root# uname -amnprsv
 Darwin gl00b05045 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48
 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64 i386
 gl00b05045:~ root# which clang
 /usr/bin/clang
 gl00b05045:~ root# clang --version
 Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
 Target: x86_64-apple-darwin11.4.2
 Thread model: posix
 gl00b05045:~ root# xcodebuild -version
 Xcode 4.6
 Build version 4H127
 }}}

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Ticket URL: <https://trac.macports.org/ticket/38018#comment:2>
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