Bug #31171: test alter_table, fulltext2, ps, sp fail,

 "Table is already up to date" vs. "OK"

On MacOSX 10.5 when you cast something to "bool"
(the built in C type) it takes values 0 or 1 
instead of 0-255 as it seems to be on older compilers.
Fixed by removing the typecast (not needed).
No test case needed : there are tests that test it.

storage/myisam/mi_open.c

@@ -916,7 +916,7 @@ uchar *mi_state_info_read(uchar *ptr, MI_STATE_INFO *state)
   key_blocks=state->header.max_block_size_index;
 
   state->open_count = mi_uint2korr(ptr);	ptr +=2;
-  state->changed= (bool) *ptr++;
+  state->changed= *ptr++;
   state->sortkey = (uint) *ptr++;
   state->state.records= mi_rowkorr(ptr);	ptr +=8;
   state->state.del = mi_rowkorr(ptr);		ptr +=8;