Changed bootstrap.sh so that you can specify the compiler to use via
the JAVAC environment variable. This enables a bootstrap process using
jikes.
Submitted by: GOMEZ Henri <hgomez@slib.fr>
Added a warning about the changed behavior of <delete dir> to WHATSNEW.
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268097 13f79535-47bb-0310-9956-ffa450edef68