[MacPorts] #16646: libxml2 update to version 2.7.1

[MacPorts]

#16646: libxml2 update to version 2.7.1
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 Reporter:  blb at macports.org  |       Owner:  cedric.luthi at gmail.com
     Type:  enhancement       |      Status:  new                   
 Priority:  Normal            |   Milestone:  Port Updates          
Component:  ports             |     Version:  1.6.0                 
 Keywords:                    |        Port:  libxml2               
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 Attached patch updates textproc/libxml2 to the current version, 2.7.1.
 Also, the autoconf/libtool stuff was removed as it builds out of the box
 for two level namespaces now.

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Ticket URL: <http://trac.macports.org/ticket/16646>
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