This makes sure shared extensions are readable by users when root's umask has been
set to a value such as 0027.

Change-Id: If495afae8eaf3a640c99ecb7598b79b59363c12c
Reviewed-on: https://gerrit.libreoffice.org/5521Reviewed-by: Petr Mladek <pmladek@suse.cz>
Tested-by: Petr Mladek <pmladek@suse.cz>