hg: jdk9/sandbox: Support for generating man pages from markdown.

[magnus.ihse.bursie at oracle.com]

Changeset: f00e76e7d53f
Author:    ihse
Date:      2017-05-09 19:45 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/f00e76e7d53f

Support for generating man pages from markdown.

! make/Javadoc.gmk
! make/common/Modules.gmk
! make/common/ProcessMarkdown.gmk