It was used for building with glibc 2.20, now is glibc 2.23, so remove it.
(From OE-Core rev: cee2794c8312a2f8266c018acfd475b1882fc0f6)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>