added BuildRequires: zlib-devel, fixes Red Hat bug #124942 Daniel

* libxml.spec.in: added BuildRequires:  zlib-devel, fixes
  Red Hat bug #124942
Daniel
diff --git a/libxml.spec.in b/libxml.spec.in
index 31e3898..f9823df 100644
--- a/libxml.spec.in
+++ b/libxml.spec.in
@@ -6,7 +6,7 @@
 Group: Development/Libraries
 Source: ftp://xmlsoft.org/libxml2-%{version}.tar.gz
 BuildRoot: %{_tmppath}/%{name}-%{version}-root
-BuildRequires: python python-devel
+BuildRequires: python python-devel zlib-devel
 URL: http://xmlsoft.org/
 Prefix: %{_prefix}
 Docdir: %{_docdir}