Some Windows compile improvements:

 - removed some unreferenced variables
 - fixed the libmysql project file by removing a duplicate file reference (merge error)

VC++Files/libmysql/libmysql.dsp

@@ -147,10 +147,6 @@ SOURCE="..\strings\ctype-czech.c"
 # End Source File
 # Begin Source File
 
-SOURCE="..\strings\ctype-cp932.c"
-# End Source File
-# Begin Source File
-
 SOURCE="..\strings\ctype-euc_kr.c"
 # End Source File
 # Begin Source File

sql/item_func.cc

@@ -4724,7 +4724,6 @@ Item_func_sp::func_name() const
 Field *
 Item_func_sp::sp_result_field(void) const
 {
-  Field *field;
   DBUG_ENTER("Item_func_sp::sp_result_field");
 
   if (!m_sp)

sql/sql_select.cc

@@ -7989,7 +7989,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
   bool  using_unique_constraint= 0;
   bool  use_packed_rows= 0;
   bool  not_all_columns= !(select_options & TMP_TABLE_ALL_COLUMNS);
-  char	*tmpname,path[FN_REFLEN], filename[FN_REFLEN];
+  char	*tmpname,path[FN_REFLEN];
   byte	*pos,*group_buff;
   uchar *null_flags;
   Field **reg_field, **from_field;

sql/unireg.cc

@@ -668,7 +668,7 @@ static bool make_empty_rec(THD *thd, File file,enum db_type table_type,
 {
   int error;
   Field::utype type;
-  uint firstpos, null_count;
+  uint null_count;
   uchar *buff,*null_pos;
   TABLE table;
   create_field *field;