hg: build-infra/jdk8: Integrate javadoc makefile better with the new build system and spec.gmk

[magnus.ihse.bursie at oracle.com]

Changeset: d2a1c6ffe480
Author:    ihse
Date:      2012-09-17 15:03 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/d2a1c6ffe480

Integrate javadoc makefile better with the new build system and spec.gmk
definitions.

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! common/makefiles/Makefile
! common/makefiles/javadoc/Javadoc.gmk