use tmp for install.jar to prevent confusion on build fails
[TITLE] so that somebody won't be like "the build failed but it produced the install jar what?"
not tested because noclassdef for pack200 because no pack200 for gentoo it's available in jdk:8, and tested.
Signed-off-by: AGentooCat agentoocat@mail.i2p
Edited by AGentooCat