hg: jigsaw/jigsaw: Support "modules" target and BUILD_MODULES buildenv in the forest build

[mandy.chung at sun.com]

Changeset: 00c40d39181b
Author:    mchung
Date:      2010-03-05 12:16 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jigsaw/rev/00c40d39181b

Support "modules" target and BUILD_MODULES buildenv in the forest build
Summary: gnumake modules or gnumake BUILD_MODULES=all all to build modules
Reviewed-by: ohair

! Makefile
! make/jdk-rules.gmk
! make/jprt.gmk