do not package .la files applied patch from Gerry Murphy for xmllint

* libxml.spec.in: do not package .la files
* xmllint.c: applied patch from Gerry Murphy for xmllint return code
* xmlschemastypes.c: fixed a couple of missing tests of parameters
  at public API entry points.
Daniel
diff --git a/libxml.spec.in b/libxml.spec.in
index 481f88e..eed0f5f 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -96,6 +96,7 @@
 rm -fr %{buildroot}
 
 %makeinstall
+rm -f $RPM_BUILD_ROOT%{_libdir}/*.la
 
 %clean
 rm -fr %{buildroot}