REGTEST: Exclude freebsd target for some reg tests.

This patch excludes freebsd target for health-checks reg tests
which rely on TCP_DEFER_ACCEPT usage. This is specific to Linux.
diff --git a/reg-tests/checks/s00000.vtc b/reg-tests/checks/s00000.vtc
index 0aae83a..93575d3 100644
--- a/reg-tests/checks/s00000.vtc
+++ b/reg-tests/checks/s00000.vtc
@@ -2,6 +2,7 @@
 feature ignore_unknown_macro
 
 #REQUIRE_VERSION=1.8
+#EXCLUDE_TARGETS=freebsd
 
 # This script test health-checks for four backends with one server by backend.
 # A syslog server is attached to each backend to check the syslog messages