Updating apichecker for GWT 2.4.

Review at http://gwt-code-reviews.appspot.com/1447807

Review by: rjrjr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10209 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/build.xml b/build.xml
index 81a956a..22dd94b 100755
--- a/build.xml
+++ b/build.xml
@@ -31,7 +31,7 @@
   </macrodef>
 
   <property name="gwt.apicheck.config" 
-    location="tools/api-checker/config/gwt22_23userApi.conf"/>
+    location="tools/api-checker/config/gwt23_24userApi.conf"/>
 
   <target name="buildonly"
           description="[action] Minimal one-platform devel build, without distro packaging">