fix word resolvable before finished

include/fh_runtime.h

@@ -119,6 +119,8 @@ extern const char *substatenames[FH_SUBSTATE_MAX];
 #define WORDFLAG_CONSTANT  0x10
 /** Something CREATEd. When executed, put the data field address on stack */
 #define WORDFLAG_CREATED  0x20
+/** Word marked as hidden is not findable, e.g. because it is being compiled. */
+#define WORDFLAG_HIDDEN  0x40
 
 /** Word struct as they are stored in the dictionary */
 struct fh_word_s {