test: remove test_state_coverage

We're going to change the protocol to send multiple changes at once, so
disable this compilation and testing for now.

We can revisit it afterwards once the protocol is stable again.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Makefile

@@ -29,7 +29,6 @@ BITCOIN_FEATURES :=				\
 FEATURES := $(BITCOIN_FEATURES)
 
 TEST_PROGRAMS :=				\
-	test/test_state_coverage		\
 	test/onion_key				\
 	test/test_onion
 
@@ -227,7 +226,6 @@ check-source: check-makefile				\
 	$(BITCOIN_HEADERS:%=check-hdr-include-order/%)
 
 full-check: check $(TEST_PROGRAMS) check-source
-	test/test_state_coverage
 
 TAGS: FORCE
 	$(RM) TAGS; find . -name '*.[ch]' | xargs etags --append