tests: fix remaining test failures under _FORTIFY_SOURCE

The getgroups test is a NetBSD tests, so just apply our larger hammer
and disable the feature entirely.  The audit test can take a more
surgical approach and use __ssp_real() appropriately, since it's a local
one.

PR:		294881
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D56735

tests/sys/audit/network.c

@@ -29,6 +29,8 @@
 #include <sys/uio.h>
 #include <sys/un.h>
 
+#include <ssp/ssp.h>
+
 #include <atf-c.h>
 #include <fcntl.h>
 #include <stdarg.h>
@@ -959,7 +961,7 @@ ATF_TC_BODY(recvmsg_failure, tc)
 	snprintf(extregex, sizeof(extregex),
 		"recvmsg.*return,failure : Bad address");
 	FILE *pipefd = setup(fds, auclass);
-	ATF_REQUIRE_EQ(-1, recvmsg(-1, NULL, 0));
+	ATF_REQUIRE_EQ(-1, __ssp_real(recvmsg)(-1, NULL, 0));
 	check_audit(fds, extregex, pipefd);
 }