Fix turbine classpath arguments in Make

We were passing "--classpath foo.jar --classpath bar.jar" to turbine,
it now wants (and may always have expected?)
"--classpath foo.jar bar.jar".

This is equivalent to Ib7e0ca64a34e236110f7b785d6a0fb51ed75567e in
Soong.

Test: m java
Change-Id: I061ebf302a215c66b1923056716b60bf0160d9bc