revert use of https due to build issues

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1859728 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build.xml b/build.xml
index 4c2a6c8..217017c 100644
--- a/build.xml
+++ b/build.xml
@@ -19,10 +19,10 @@
     <property name="ant.build.javac.source" value="1.6"/>
     <property name="ant.build.javac.target" value="1.6"/>
 
-    <property name="version.base" value="3.1.0"/>
+    <property name="version.base" value="3.1.1"/>
     <property name="version.rc" value=""/>
 
-    <property name="repository.m2" value="https://repo1.maven.org"/>
+    <property name="repository.m2" value="http://repo1.maven.org"/>
     <property environment="ENV"/>
 
     <property name="compile.lib" location="compile-lib"/>