groovy: GROOVY_HOME should be pointed at opt_prefix

This will prevent issues when Groovy is next updated.

Closes #19347.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Ur/Web 20130421

Closes #19346.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Closes #19346.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>