Add missing test data not referenced by build.properties

See #504

Author: iloveeclipse

team/tests/org.eclipse.compare.tests/build.properties

@@ -18,7 +18,8 @@ bin.includes = plugin.properties,\
                .,\
                META-INF/,\
                patchdata/,\
-               linereaderdata/
+               linereaderdata/,\
+               labelContributionData/
 
 src.includes = about.html