Some fixes to avoid compiler warnings.

mysql-test/my_manage.c:
  Avoid warning: i not used in case of Windows.
mysql-test/mysql_test_run_new.c:
  Removed unused variable.
sql/item_func.cc:
  Removed unused variables.
strings/ctype-simple.c:
  Added cast.
strings/ctype-ucs2.c:
  Added cast.

mysql-test/my_manage.c

@@ -230,7 +230,10 @@ int wait_for_server_start(char *bin_dir __attribute__((unused)),
                           char *user, char *password, int port,char *tmp_dir)
 {
   arg_list_t al;
-  int err= 0, i;
+  int err= 0;
+#ifndef __WIN__
+  int i;
+#endif
   char trash[FN_REFLEN];
 
   /* mysqladmin file */

mysql-test/mysql_test_run_new.c

@@ -1716,7 +1716,6 @@ int main(int argc, char **argv)
       int* handle;
       char test[FN_LEN];
       char mask[FN_REFLEN];
-      char *p;
       int position;
 
       /* single test */

sql/item_func.cc

@@ -3252,7 +3252,6 @@ Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
 		     LEX_STRING component)
 {
   sys_var *var;
-  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *pos;
   LEX_STRING *base_name, *component_name;
 
   if (component.str == 0 &&

strings/ctype-simple.c

@@ -867,7 +867,7 @@ int my_longlong10_to_str_8bit(CHARSET_INFO *cs __attribute__((unused)),
   while (long_val != 0)
   {
     long quo= long_val/10;
-    *--p = '0' + (long_val - quo*10);
+    *--p = (char) ('0' + (long_val - quo*10));
     long_val= quo;
   }
   

strings/ctype-ucs2.c

@@ -1043,7 +1043,7 @@ int my_ll10tostr_ucs2(CHARSET_INFO *cs __attribute__((unused)),
   while (long_val != 0)
   {
     long quo= long_val/10;
-    *--p = '0' + (long_val - quo*10);
+    *--p = (char) ('0' + (long_val - quo*10));
     long_val= quo;
   }