[PATCH] mtd-utils: serve_image: use proper POSIX_C_SOURCE value

[Brian Norris]

On Thu, Oct 01, 2015 at 02:49:44AM +0300, Kirill Smirnov wrote:
> struct addrinfo and friends conform to POSIX.1-2001, not earlier.
> This patch fixes linking against latest glibc 2.22

Please include your 'Signed-off-by', and use inline patches, not
attachments. For reference, see the Linux patch submission guidelines:

https://www.kernel.org/doc/Documentation/SubmittingPatches