Delete the now-unused SVf_AMAGIC flag constant

Author: leonerd

sv.h

@@ -494,14 +494,7 @@ These guys don't need the curly blocks
 
 #define PRIVSHIFT 4	/* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
 
-/* SVf_AMAGIC means that the stash *may* have overload methods. It's
- * set each time a function is compiled into a stash, and is reset by the
- * overload code when called for the first time and finds that there are
- * no overload methods. Note that this used to be set on the object; but
- * is now only set on stashes.
- */
-#define SVf_AMAGIC	0x10000000  /* now unused on scalars */
-#define SVphv_OVERLOADED  SVf_AMAGIC  /* stash has magical overloaded methods */
+#define SVphv_OVERLOADED  0x10000000  /* stash has magical overloaded methods */
 #define SVf_IsCOW	0x10000000  /* copy on write (shared hash key if
                                        SvLEN == 0) */