hg: jdk/sandbox: 8217448: Check for pandoc availability using ENABLE_PANDOC and not PANDOC

[chris.hegarty at oracle.com]

Changeset: b156fd0a4607
Author:    ihse
Date:      2019-01-23 10:23 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/b156fd0a4607

8217448: Check for pandoc availability using ENABLE_PANDOC and not PANDOC
Reviewed-by: tbell

! make/CompileToolsJdk.gmk
! make/UpdateBuildDocs.gmk