gettext: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
gettext: update to gettext-0.18.3.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
autoconf: depends on gettext:host

Signed-off-by: Stephan Raue <stephan@openelec.tv>
pkg-config: depends on gettext:host

Signed-off-by: Stephan Raue <stephan@openelec.tv>
service.openelec.settings: update to service.openelec.settings-0.2.10

Signed-off-by: Stephan Raue <stephan@openelec.tv>