fix some -Wstrict-prototypes warnings

terms.c

@@ -41,7 +41,7 @@ static int xpix, ypix, nbs, obs = 0;
 
 static int is_xterm = 0;
 
-void mouse_init(), mouse_end();
+void mouse_init(void), mouse_end(void);
 int mouseActive = 0;
 #endif				/* USE_MOUSE */
 
@@ -263,7 +263,7 @@ check_cygwin_console(void)
 char *getenv(const char *);
 MySignalHandler reset_exit(SIGNAL_ARG), reset_error_exit(SIGNAL_ARG), error_dump(SIGNAL_ARG);
 void setlinescols(void);
-void flush_tty();
+void flush_tty(void);
 
 #ifndef SIGIOT
 #define SIGIOT SIGABRT
@@ -452,7 +452,7 @@ extern int tgetflag(char *);
 extern char *tgetstr(char *, char **);
 extern char *tgoto(char *, int, int);
 extern int tputs(char *, int, int (*)(char));
-void clear(), wrap(), touch_line(), touch_column(int);
+void clear(void), wrap(void), touch_line(void), touch_column(int);
 #if 0
 void need_clrtoeol(void);
 #endif
@@ -2654,7 +2654,7 @@ mouse_inactive()
 #endif				/* USE_MOUSE */
 
 void
-flush_tty()
+flush_tty(void)
 {
     if (ttyf)
 	fflush(ttyf);
@@ -2662,7 +2662,7 @@ flush_tty()
 
 #ifdef USE_IMAGE
 void
-touch_cursor()
+touch_cursor(void)
 {
 #ifdef USE_M17N
     int i;