Log Message:
Update textproc/libxml2 to 2.6.11.

2.6.11: July 5 2004:
   - Schemas: a lot of changes and improvements by Kasimier Buchcik for
    attributes, namespaces and simple types.
   - build fixes: --with-minimum (William Brack),  some gcc cleanup
    (William), --with-thread-alloc (William)
   - portability: Windows binary package change (Igor Zlatkovic), Catalog
    path on Windows
   - documentation: update to the tutorial (John Fleck), xmllint return code
    (John Fleck), man pages (Ville Skytta),
   - bug fixes: C14N bug serializing namespaces (Aleksey Sanin), testSAX
    properly initialize the library (William), empty node set in XPath
    (William), xmlSchemas errors (William), invalid charref problem pointed
    by Morus Walter, XInclude xml:base generation (William), Relax-NG bug
    with div processing (William), XPointer and xml:base problem(William),
    Reader and entities, xmllint return code for schemas (William), reader
    streaming problem (Steve Ball), DTD serialization problem (William),
    libxml.m4 fixes (Mike Hommey), do not provide destructors as methods on
    Python classes, xmlReader buffer bug, Python bindings memory interfaces
    improvement (with Stéphane Bidoul), Fixed the push parser to be back to
    synchronous behaviour.
   - improvement: custom per-thread I/O enhancement (Rob Richards), register
    namespace in debug shell (Stefano Debenedetti), Python based regression
    test for non-Unix users (William), dynamically increase the number of
    XPath extension functions in Python and fix a memory leak (Marc-Antoine
    Parent and William)
   - performance: hack done with Arjan van de Ven to reduce ELF footprint
    and generated code on Linux, plus use gcc runtime profiling to optimize
    the code generated in the RPM packages.