package/libinput: bump version to 0.19.0, add locale dependency

Since 2015-04-22 libinput needs locale support:
http://cgit.freedesktop.org/wayland/libinput/commit/src/libinput-util.c?id=5c671e0375cc03032fcac26efe4a7835a74c8bfc



This patch adds the needed dependency also to
weston and xdriver_xf86-input-libinput.

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