legacy: refactor SKIPPED_MESSAGES in the Makefile

legacy/firmware/protob/Makefile

@@ -2,10 +2,10 @@ ifneq ($(V),1)
 Q := @
 endif
 
+SKIPPED_MESSAGES := Binance Cardano DebugMonero Eos Monero Ontology Ripple Tezos
+
 ifeq ($(BITCOIN_ONLY), 1)
-SKIPPED_MESSAGES := Cardano Tezos Ripple Monero DebugMonero Ontology Eos Binance Ethereum Lisk NEM Stellar
-else
-SKIPPED_MESSAGES := Cardano Tezos Ripple Monero DebugMonero Ontology Eos Binance
+SKIPPED_MESSAGES += Ethereum Lisk NEM Stellar
 endif
 
 all: messages_map.h messages_map_limits.h messages-bitcoin.pb.c messages-common.pb.c messages-crypto.pb.c messages-debug.pb.c messages-ethereum.pb.c messages-management.pb.c messages-nem.pb.c messages.pb.c messages-stellar.pb.c messages-lisk.pb.c messages_nem_pb2.py