switch to using a flag parameter on newcham()

include/extern.h

@@ -1568,7 +1568,7 @@ extern boolean valid_vampshiftform(int, int);
 extern boolean validvamp(struct monst *, int *, int);
 extern int select_newcham_form(struct monst *);
 extern void mgender_from_permonst(struct monst *, struct permonst *);
-extern int newcham(struct monst *, struct permonst *, boolean, boolean);
+extern int newcham(struct monst *, struct permonst *, unsigned);
 extern int can_be_hatched(int);
 extern int egg_type_from_parent(int, boolean);
 extern boolean dead_species(int, boolean);

include/hack.h

@@ -585,6 +585,11 @@ enum bodypart_types {
 #define ECMD_CANCEL 0x02 /* cmd canceled by user */
 #define ECMD_FAIL   0x04 /* cmd failed to finish, maybe with a yafm */
 
+/* flags for newcham() */
+#define NO_NC_FLAGS          0U
+#define NC_SHOW_MSG          0x01U
+#define NC_VIA_WAND_OR_SPELL 0x02U
+
 /* values returned from getobj() callback functions */
 enum getobj_callback_returns {
     /* generally invalid - can't be used for this purpose. will give a "silly