conv.c did not compile anymore. Fix wrong header file inclusion.

src/backend/utils/mb/conv.c

@@ -6,13 +6,11 @@
  * WIN1250 client encoding support contributed by Pavel Behal
  * SJIS UDC (NEC selection IBM kanji) support contributed by Eiji Tokuya
  *
- * $Id: conv.c,v 1.22 2001/02/10 02:31:27 tgl Exp $
+ * $Id: conv.c,v 1.23 2001/02/11 01:56:58 ishii Exp $
  *
  *
  */
-/* can be used in either frontend or backend */
-#include "postgres_fe.h"
-
+#include "postgres.h"
 #include "mb/pg_wchar.h"
 
 #ifdef UNICODE_CONVERSION