g++ really does not like the missing prototypes
here we were missing close() and read() so include
unistd.h to get them
(From OE-Core rev: f32b30ef4711fe602a11549f77be06a0eef2fc0d)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>