Minors changes for the Windows 3.23.47 release

mysys/my_bitmap.c:
  Eliminate unresolved external linkage for bzero
sql/sql_do.cc:
  Eliminate warning for unreferenced local variable

mysys/my_bitmap.c

@@ -27,6 +27,7 @@
 #include <my_bitmap.h>
 #include <assert.h>
 #include <string.h>
+#include <m_string.h>
 
 inline void bitmap_lock(MY_BITMAP* map)
 {

sql/sql_do.cc

@@ -22,7 +22,6 @@
 
 int mysql_do(THD *thd, List<Item> &values)
 {
-  int error;
   List_iterator<Item> li(values);
   Item *value;
   DBUG_ENTER("mysql_do");