hg: jdk9/sandbox: Merge

[magnus.ihse.bursie at oracle.com]

Changeset: aa232c8a17d3
Author:    ihse
Date:      2017-03-13 14:50 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/aa232c8a17d3

Merge

! README
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! common/doc/building.html
! common/doc/building.md
! make/Main.gmk
! make/UpdateBuildDocs.gmk