[w3m-dev 02749] cleanup code for editor,mailer,extbrowser

From: Hironori Sakamoto <hsaka@mth.biglobe.ne.jp>

proto.h

@@ -1,4 +1,4 @@
-/* $Id: proto.h,v 1.21 2001/12/26 18:17:57 ukai Exp $ */
+/* $Id: proto.h,v 1.22 2001/12/26 18:29:33 ukai Exp $ */
 /* 
  *   This file was automatically generated by version 1.7 of cextract.
  *   Manual editing not recommended.
@@ -479,6 +479,8 @@ extern char *last_modified(Buffer *buf);
 extern Str romanNumeral(int n);
 extern Str romanAlphabet(int n);
 extern void mySystem(char *command, int background);
+extern Str myExtCommand(char *cmd, char *arg, int redirect);
+extern Str myEditor(char *cmd, char *file, int line);
 extern char *file_to_url(char *file);
 extern char *expandName(char *name);
 extern Str tmpfname(int type, char *ext);