Disable iconv, as configure.ac attempts to run a
cross-compiled test program otherwise.
(From OE-Core rev: 6b18acfbe61aef449743f5ce0dfd77f83f5cb2a5)
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
