Changing the environment is not thread-safe, so it's best avoided. As a
replacement, users should set the variable in their shell startup
configuration (e.g. /etc/environment or ~/.bash_profile). Then all
applications using DVDCSS will be affected (which seems better).
This option was probably very seldom used anyway.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>