make sure to first try to get /usr/lib/libxml2 before trying /sw/lib/libxml2 on MacOS X. The /usr/lib version is a proper universal binary containing a  64-bit version.
make sure to first try to get /usr/lib/libxml2 before trying /sw/lib/libxml2
on MacOS X. The /usr/lib version is a proper universal binary containing a 
64-bit version.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@23636 27541ba8-7e3a-0410-8455-c3a389f83636

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