Switch specfile to bz2 source.

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@1840501 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/xerces-c.spec b/xerces-c.spec
index f03b955..0fa6093 100644
--- a/xerces-c.spec
+++ b/xerces-c.spec
@@ -3,7 +3,7 @@
 Version:	3.2.2
 Release:	1
 URL:		http://xerces.apache.org/xerces-c/
-Source0:	%{name}-%{version}.tar.gz
+Source0:	%{name}-%{version}.tar.bz2
 License:        Apache
 Group:		Libraries
 BuildRoot:	%{_tmppath}/%{name}-root