hg: jdk/sandbox: Make pandoc conversion of man pages work again.

[magnus.ihse.bursie at oracle.com]

Changeset: 55725429863a
Author:    ihse
Date:      2018-10-10 10:12 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/55725429863a

Make pandoc conversion of man pages work again.

! make/Docs.gmk
! make/Main.gmk
! make/common/ProcessMarkdown.gmk