MFH: r476675

www/chromium: minor fix in pkg-message

%%DATADIR%% is not being expanded in pkg-message, and it shows up like this:

--II--
Chromium has a known problem of hanging tabs. The workaround
for this problem is to mount ~/.cache/chromium as memory-fs.
In order to do this, before you run Chromium, please run the
following script as root once for each user who uses Chromium
(replace {user}/{group} with your user/group names):

%%DATADIR%%/fix-hanging-tabs.sh {user} {group}

• Add DATADIR to SUB_LIST to correctly be replaced with its value and move pkg-message to FILESDIR.
• Bump PORTREVISION

Reported by: olgeni via mail

Approved by: ports-secteam (blanket)