CLASSPATH is prepended to system classes! Bad if it points to another JDK.

The current setting of the CLASSPATH environment variables should have
no effect on running javac. i.e. the javac script should override CLASSPATH
so that it contains the directories with the classes necessary to successfully
run javac.
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fy - 12Oct94: Passing this to Timmy, who might want to give it to someone else.
This isn't a compiler bug, it's a "release" bug.

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mem - 07 Nov 95: Tim: I originally submitted this bug, and I've run into the implications of this again on several occassions. The wording of this synopsis is
a little weird so I'd like to be more specific.

Suppose that my classpath includes my personal workspace (or some other directory
that contains the java development environment classes):
.:/home/mem/ws/java/build/classes

Now, let's say that I run javac from the command line and the javac that I get is from,
say, /usr/local/java/latest/bin. That is, the javac that I get...is NOT the javac in my
workspace.

If my workspace is NOT built, then everything is fine. However, if I do have my
workspace built, then the classes in my workspace pre-empt the classes that "belong"
with the compiler that I'm running and the compiler seg faults.

THIS IS UNACCEPTABLE. The compiler should ensure that it can run...by doing the
right thing with the classpath. Right now the compiler script *appends* the directory
where the currently running javac lives to the *end* of the classpath. It should
*prepend*.

I believe that this problem affects the other scripts as well.