package/apparmor: fix compilation with libintl

When libintl is enabled, Apparmor should link againts libintl.
The patch is already sent upstream.

Fixes:
http://autobuild.buildroot.net/results/8bf/8bf5ce74721f828b01fd708443d020cdf8dc7d3a



Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>