Add dependency on Scala compiler 2.7.5.
Add dependency on Scala compiler 2.7.5.

There is a glue-code planned to be written in Scala thus we need this
dependency.

This configuration of Scala allows free mixing of Scala and Java code
that references each other.

Change-Id: I83b28f16561fedaa11c79b2e6503414525f20318
Signed-off-by: Grzegorz Kossakowski <94bb8817547ff482e058944c32407075c017c605@google.com>

GerritCodeReview/gerrit-attic,GerritCodeReview/gerrit-attic,GerritCodeReview/gerrit-attic