Disable the NetBSD-specific EFAULT requirements test in gettimeofday_err

FreeBSD doesn't specifically list this as a supported error, and in some
configurations/versions of FreeBSD, this test will segfault as the memory
address might be evaluated in userspace, instead of in kernel space like
in NetBSD.

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

contrib/netbsd-tests/lib/libc/sys/t_gettimeofday.c

@@ -46,9 +46,11 @@ ATF_TC_HEAD(gettimeofday_err, tc)
 ATF_TC_BODY(gettimeofday_err, tc)
 {
 
+#ifdef __NetBSD__
 	errno = 0;
 
 	ATF_REQUIRE_ERRNO(EFAULT, gettimeofday((void *)-1, NULL) != 0);
+#endif
 }
 
 ATF_TC(gettimeofday_mono);