Added definition of DEL key (Ctrl-BS).

src/uifc/uifc.h

@@ -193,7 +193,7 @@
 #define CR		'\r'				/* Carriage return			^M	*/
 #define ESC 	0x1b				/* Escape					^[	*/
 #define SP      ' '                 /* Space                        */
-
+#define DEL     0x7f                /* Delete                   ^BS */
 #endif
 
 #define CLREOL 256