Clean up const-vs-not-const compiler warning in MULTIBYTE code.

'Twas my fault, I think.

src/backend/utils/mb/variable.c

@@ -2,7 +2,7 @@
  * This file contains some public functions
  * related to show/set/reset variable commands.
  * Tatsuo Ishii
- * $Id: variable.c,v 1.6 2000/01/18 13:44:48 ishii Exp $
+ * $Id: variable.c,v 1.7 2000/04/20 22:40:18 tgl Exp $
  */
 
 #include "postgres.h"
@@ -10,7 +10,7 @@
 #include "mb/pg_wchar.h"
 
 bool
-parse_client_encoding(const char *value)
+parse_client_encoding(char *value)
 {
 	int			encoding;
 
@@ -60,7 +60,7 @@ reset_client_encoding()
 }
 
 bool
-parse_server_encoding(const char *value)
+parse_server_encoding(char *value)
 {
 	elog(NOTICE, "SET SERVER_ENCODING is not supported");
 	return TRUE;

src/include/mb/pg_wchar.h

-/* $Id: pg_wchar.h,v 1.13 2000/01/18 05:08:31 ishii Exp $ */
+/* $Id: pg_wchar.h,v 1.14 2000/04/20 22:40:18 tgl Exp $ */
 
 #ifndef PG_WCHAR_H
 #define PG_WCHAR_H
@@ -112,10 +112,10 @@ extern int	pg_mbcliplen(const unsigned char *, int, int);
 extern pg_encoding_conv_tbl *pg_get_encent_by_encoding(int);
 extern bool show_client_encoding(void);
 extern bool reset_client_encoding(void);
-extern bool parse_client_encoding(const char *);
+extern bool parse_client_encoding(char *);
 extern bool show_server_encoding(void);
 extern bool reset_server_encoding(void);
-extern bool parse_server_encoding(const char *);
+extern bool parse_server_encoding(char *);
 extern int	pg_set_client_encoding(int);
 extern int	pg_get_client_encoding(void);
 extern unsigned char *pg_client_to_server(unsigned char *, int);