add set_escdelay function

this function is used by GNU nano 2.7.0. it's trivial so we can just add it.

GNUmakefile

@@ -88,7 +88,7 @@ CU_SRCS_=acs.c addbytes.c addch.c addchnstr.c addnstr.c attributes.c \
 	mvwin.c newwin.c nodelay.c notimeout.c overlay.c overwrite.c pause.c \
 	printw.c putchar.c refresh.c resize.c scanw.c screen.c scroll.c \
 	scrollok.c setterm.c standout.c timeout.c toucholap.c touchwin.c \
-	tstp.c tty.c unctrl.c underscore.c
+	tstp.c tty.c unctrl.c underscore.c escdelay.c
 
 
 ifndef DISABLE_WCHAR

libcurses/curses.h

@@ -1010,6 +1010,8 @@ int wbkgrnd(WINDOW *, const cchar_t *);
 void wbkgrndset(WINDOW *, const cchar_t *);
 int wgetbkgrnd(WINDOW *, cchar_t *);
 
+int set_escdelay(int);
+
 /* Private functions that are needed for user programs prototypes. */
 int	 __cputchar(int);
 int	 __waddbytes(WINDOW *, const char *, int, attr_t);

libcurses/escdelay.c

@@ -0,0 +1,6 @@
+#include "curses.h"
+
+int set_escdelay(int value) {
+	ESCDELAY = value;
+}
+