Use empty initializer to silence GCC 4.9 or older

Use empty initializer to silence GCC 4.9 or older

Use empty initializer to silence GCC 4.9 or older:

getaddrinfo.c: In function ‘gaih_inet’:
getaddrinfo.c:1135:24: error: missing braces around initializer [-Werror=missing-braces]
       / sizeof (struct gaih_typeproto)] = {0};
                        ^

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>