Disable security key on fbsd6 test host.

.github/configs

@@ -158,6 +158,10 @@ case "${TARGET_HOST}" in
 	# scp 3-way connection hangs on these so skip until sorted.
 	SKIP_LTESTS=scp3
 	;;
+    fbsd6)
+	# Native linker is not great with PIC so OpenSSL is built w/out.
+	CONFIGFLAGS="${CONFIGFLAGS} --disable-security-key"
+	;;
     hurd)
 	SKIP_LTESTS="forwarding multiplex proxy-connect hostkey-agent agent-ptrace"
 	;;