Tiny change for 'make tests': raised the number of expected failures for

* Makefile.am: Tiny change for 'make tests': raised
  the number of expected failures for James Clark's
  XML Schema datatype tests from 10 to 11. The additional
  reported error was agreed to be correct long time ago,
  but we missed to adjust the message reported by
  the testing script.
diff --git a/Makefile.am b/Makefile.am
index ee09a7b..5ef9d90 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1070,7 +1070,7 @@
 	    LD_LIBRARY_PATH="$(top_builddir)/.libs:$$LD_LIBRARY_PATH" ; \
 	    export LD_LIBRARY_PATH; \
 	    echo "## XML Schemas datatypes Python based test suite" ; \
-	    echo "## It is normal to see 10 errors reported" ; \
+	    echo "## It is normal to see 11 errors reported" ; \
 	    $(CHECKER) $(PYTHON) $(srcdir)/check-xsddata-test-suite.py ; \
 	  fi)
 	@(if [ -x $(PYTHON) -a -d xstc ] ; then cd xstc ; $(MAKE) CHECKER="$(CHECKER)" MAKEFLAGS+=--silent pytests ; fi)