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e4c914ee - libxml: Update included libxml2 to version 2.9.9.

libxml: Update included libxml2 to version 2.9.9. * gnulib-local/lib/libxml/*: Update from libxml2 2.9.9. * gnulib-local/m4/libxml.m4 (gl_LIBXML): Don't test for _stat.