When checking whether there is iconv, the configure file always check
the host env.
Now we make it working properly by adding correct prefix for cross-
compiling environment.
(From OE-Core rev: ac588cc63315e4cb4ec84a1de87533e61d2dc6b6)
Signed-off-by: Zheng Junling <zhengjunling@huawei.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>