gettext: Correct autoconf-lib-link code to defer to the compiler's library search...

gettext: Correct autoconf-lib-link code to defer to the compiler's library search paths.

Ultimately we should have --with-<lib> and --without-<lib> for everything,
however if a recipie does not the suspect code wanders through the host system
searching for a working library. OE takes great pains to set that all up, lets
let it decide the right library.

Signed-off-by: Jeremy Puhlman <jpuhlman@mvista.com>
Signed-off-by: Chris Larson <clarson@mvista.com>