Update libxml to 2.7.7.

third_party/libxml/patches/icu-configure

Index: third_party/libxml/patches/icu-configure
diff --git a/third_party/libxml/patches/icu-configure b/third_party/libxml/patches/icu-configure
new file mode 100644
index 0000000000000000000000000000000000000000..f7e2395a3a0a21075082c986bf9ddeebc9ce056e
--- /dev/null
+++ b/third_party/libxml/patches/icu-configure
@@ -0,0 +1,28 @@
+Modifications to configure.in:
+- set the WITH_ICU flag unconditionally
+- only output files we use
+
+Index: libxml/configure.in
+===================================================================
+--- libxml.orig/configure.in	2010-07-09 15:00:21.600113911 -0700
++++ libxml/configure.in	2010-07-09 15:02:50.299108047 -0700
+@@ -1229,6 +1229,9 @@
+ fi
+ AC_SUBST(WITH_OUTPUT)
+ 
++WITH_ICU=1
++AC_SUBST(WITH_ICU)
++
+ WITH_ICONV=0
+ if test "$with_iconv" = "no" ; then
+     echo Disabling ICONV support
+@@ -1456,7 +1459,7 @@
+ ln -s Copyright COPYING
+ 
+ # keep on one line for cygwin c.f. #130896
+-AC_OUTPUT(libxml2.spec:libxml.spec.in Makefile include/Makefile include/libxml/Makefile doc/Makefile doc/examples/Makefile doc/devhelp/Makefile example/Makefile python/Makefile python/tests/Makefile xstc/Makefile include/libxml/xmlversion.h xml2-config libxml-2.0.pc libxml-2.0-uninstalled.pc python/setup.py)
++AC_OUTPUT(include/libxml/xmlversion.h xml2-config)
+ 
+-chmod +x xml2-config python/setup.py
++chmod +x xml2-config
+ echo Done configuring