Inreased buffer size for the Linux gethostbyname_r() test

struct hostent h;

struct hostent *hp;

char *name = "localhost";

char buf[10];

char buf[8192];

int rc;

int h_errno;

rc = gethostbyname_r(name, &h, buf, 10, &hp, &h_errno);

rc = gethostbyname_r(name, &h, buf, 8192, &hp, &h_errno);

exit (rc != 0 ? 1 : 0); }],[

	    AC_MSG_RESULT(yes)

	    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6)