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/s00002.vtc b/reg-tests/checks/s00002.vtc
index 0000724..2449ba7 100644
--- a/reg-tests/checks/s00002.vtc
+++ b/reg-tests/checks/s00002.vtc
@@ -2,6 +2,7 @@
 feature ignore_unknown_macro
 
 #REQUIRE_VERSION=1.8
+#EXCLUDE_TARGETS=freebsd
 
 # This script start 40 servers named s0 up to s39.
 # For 0 <= i <= 19: