xkeyboard-config: Inherit gettext

xkeyboard-config: Inherit gettext

In a GPLv3-free build we have two different versions of gettext in sysroot due
to GPLv3 restrictions. In this case we need gettext-native too so we can have
the needed macros and avoid errors like:
"error: possibly undefined macro: AM_GNU_GETTEXT"

The needed dependency is added by gettext class which is prefered because it
takes care of NLS flags too.

(From OE-Core rev: 23d8a4d64e9ff126d6460a69e6d086b1c86e87a9)

(From OE-Core rev: 1975981e7777748c2b45b16e47ec704a9c37b56b)

Signed-off-by: Andrei Gherzan <andrei.gherzan@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>