The uclibc configuration requires the gnu libiconv, so tell configure which one to use
[YOCTO #5431] (one of many)
(From OE-Core rev: a90b32d63c8a816462b42a33851e4e5e6041bbca)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>