hg: build-infra/jdk8: Added --enable-sjavac to use sjavac. Default off. Even if enabled

[fredrik.ohrstrom at oracle.com]

Changeset: 57c6b5b22a69
Author:    ohrstrom
Date:      2012-05-23 02:02 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/57c6b5b22a69

Added --enable-sjavac to use sjavac. Default off. Even if enabled
it does not currently build any classes yet, it mostly scans the
sources. The functionality to build is in sjavac, but some more
changes to the JavaCompilation.gmk is needed.

! common/autoconf/configure
! common/autoconf/configure.ac
! common/autoconf/spec.gmk.in
! common/makefiles/JavaCompilation.gmk