patch Charles Bozeman for validation of all the date, time, and duration

* xmlschemastypes.c: patch Charles Bozeman for validation of
  all the date, time, and duration types
* test/schemas/dur_0* result/schemas/dur_0*: associated tests
* configure.in: fixed an error pointed by an user
* xml2-config.in: fixed an error pointed by an user
Daniel
diff --git a/configure.in b/configure.in
index a026f87..054ed7a 100644
--- a/configure.in
+++ b/configure.in
@@ -425,6 +425,7 @@
     echo Disabling XPATH support
     with_xptr="no"
     with_c14n="no"
+    with_xinclude="no"
     WITH_XPATH=0
     XPATH_OBJ=
 else