Make bootjars work with OUT_DIR & friends

We were pre-pending $TOP to a path that was already absolute.

Test: OUT_DIR=<whatever> ./test/run-test --build-with-javac-dx --host \
                                         001-HelloWorld

Change-Id: Ib0b5bfdcc5abbe769af7f264f0e8ce0dfbebaf2a
1 file changed