fix search problem on different charset page than display charset

* proto.h (conv_search_string): added
* search.c (migemostr): use conv_search_string
	(conv_search_string): added
* main.c (srchcore): use conv_search_string
	(reMark): ditto
* menu.c (menu_search_forward): ditto
	(menu_search_backward): ditto
	(menu_search_next_previous): ditto
From: Fumitoshi UKAI  <ukai@debian.or.jp>

proto.h

@@ -1,4 +1,4 @@
-/* $Id: proto.h,v 1.97 2003/10/05 18:52:51 ukai Exp $ */
+/* $Id: proto.h,v 1.98 2004/03/23 16:44:02 ukai Exp $ */
 /* 
  *   This file was automatically generated by version 1.7 of cextract.
  *   Manual editing not recommended.
@@ -336,6 +336,11 @@ extern Str correct_irrtag(int status);
 #ifdef USE_MIGEMO
 extern void init_migemo(void);
 #endif
+#ifdef USE_M17N
+extern char *conv_search_string(char *str, wc_ces f_ces);
+#else
+#define conv_search_string(str, f_ces)	str
+#endif
 extern int forwardSearch(Buffer *buf, char *str);
 extern int backwardSearch(Buffer *buf, char *str);
 extern void pcmap(void);