xbmc: Fix compile error with missing host-gettext

xbmc: Fix compile error with missing host-gettext

autoreconf -vif lib/cpluff
autoreconf: Entering directory `lib/cpluff'
autoreconf: running: autopoint --force
Can't exec "autopoint": No such file or directory at /home/buildroot/output/host/usr/share/autoconf/Autom4te/FileUtils.pm line 345.
autoreconf: failed to run autopoint: No such file or directory
autoreconf: autopoint is needed because this package uses Gettext
make[1]: *** [lib/cpluff/configure] Error 1

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>