cbfstool: Add header file for ntohl & htonl on Apple

On Apple OS X, the ntohl and htonl need including header,
 #include <arpa/inet.h>

Please refer the manpage for these command on OS X,
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/htonl.3.html

Change-Id: Ia942c58f34637c18222fbf985b93c48abf63c5b8
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/11672
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed