Updated ecj.jar

[Tom Tromey]

I have updated ecj.jar and ecj-source.tar.bz2 on sourceware.org.
This is the "reference ecj" that is used to build the .class files in
libjava.

If you have a build where compiling from .java to .class is enabled,
you must update your ecj.jar.  You can do this by running
contrib/download_ecj.

I will check in the updated .class files shortly.

This update is being done because we have found a few bugs in the
earlier ecj.

Since there is no GCC release relying on the previous ecj.jar, I have
deleted it.  Just as a reminder, our plan is to have versioned copies
of the .jars for release branches.

Tom