it was reported quite a few times that xml2-config --cflags should not

* configure,in: it was reported quite a few times that
  xml2-config --cflags should not output
  -I$includeprefix/libxml2/libxml because libxml2 header names
  clashes with existing names like list.h from C++ stl.
  Includes should be #include<libxml/xxx.h> so ...
Daniel
diff --git a/configure.in b/configure.in
index 6c72aaa..5a697ad 100644
--- a/configure.in
+++ b/configure.in
@@ -148,7 +148,7 @@
   [AC_DEFINE(HAVE_ISINF)]))
 
 XML_LIBDIR='-L${libdir}'
-XML_INCLUDEDIR='-I${includedir}/libxml2/libxml -I${includedir}/libxml2'
+XML_INCLUDEDIR='-I${includedir}/libxml2'
 
 dnl
 dnl Extra flags