tnc-ifmap: Remove prototypical IF-MAP plugin

This was primarily used in our labs to visualize some TNC aspects but
the third-party daemon and frontend we used have not seen any development
in a decade.  There never was any industry interest in this protocol
anyway, so just remove it.

testing/scripts/recipes/013_strongswan.mk

@@ -39,7 +39,6 @@ CONFIG_OPTS = \
 	--enable-eap-ttls \
 	--enable-eap-peap \
 	--enable-eap-tnc \
-	--enable-tnc-ifmap \
 	--enable-tnc-pdp \
 	--enable-tnc-imc \
 	--enable-tnc-imv \