Get rid of duplicate const declaration specifier warning in tst-resolv-qtypes.c.

[Paul Eggert]

H.J. Lu wrote:
> -static const const char *domain = "www.example.com";
> +static const char * const domain = "www.example.com";

Why not:

static const char domain[] = "www.example.com";

instead, before you backport?  It's simpler and less confusing.