Make sure bootstrap.sh runs in a clean environment by removing build/classes.

bootstrap.bat already had this.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268849 13f79535-47bb-0310-9956-ffa450edef68

bootstrap.sh

@@ -41,6 +41,10 @@ if [ -d "bootstrap" ] ; then
   rm -r bootstrap
 fi
 
+if [ -d "build/classes" ] ; then
+  rm -r build/classes
+fi
+
 CLASSPATH=lib/crimson.jar:lib/jaxp.jar:${CLASSPATH}
 
 DIRLIBS=lib/optional/*.jar