common/features: use bitmaps internally, have explicit init function.

This is to prepare for dynamic features, including making plugins first
class citizens at setting them.

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

gossipd/test/run-next_block_range.c

@@ -1,6 +1,7 @@
 #include "../seeker.c"
 #include <ccan/err/err.h>
 #include <common/json_stream.h>
+#include <common/memleak.h>
 #include <common/wireaddr.h>
 #include <stdarg.h>
 #include <stdio.h>
@@ -37,6 +38,9 @@ struct oneshot *new_reltimer_(struct timers *timers UNNEEDED,
 			      struct timerel expire UNNEEDED,
 			      void (*cb)(void *) UNNEEDED, void *arg UNNEEDED)
 { fprintf(stderr, "new_reltimer_ called!\n"); abort(); }
+/* Generated stub for notleak_ */
+void *notleak_(const void *ptr UNNEEDED, bool plus_children UNNEEDED)
+{ fprintf(stderr, "notleak_ called!\n"); abort(); }
 /* Generated stub for query_channel_range */
 bool query_channel_range(struct daemon *daemon UNNEEDED,
 			 struct peer *peer UNNEEDED,