Update linenoise.hpp with current upstream version.

Author: kpeeters

libs/linenoise/linenoise.hpp

@@ -777,7 +777,7 @@ inline void InterpretEscSeq(void)
                     if (es_argv[0] == 21)   // ESC[21t Report xterm window's title
                         {
                         WCHAR buf[MAX_PATH * 2];
-                        DWORD len = GetConsoleTitleW(buf + 3, lenof(buf) - 3 - 2);
+                        len = GetConsoleTitleW(buf + 3, lenof(buf) - 3 - 2);
                         // Too bad if it's too big or fails.
                         buf[0] = ESC;
                         buf[1] = ']';
@@ -1025,7 +1025,7 @@ inline int win32read(int *c) {
                         *c = 8;
                         return 1;
                     case VK_DELETE:
-                        *c = 127;
+                        *c = 4; /* same as Ctrl+D above */
                         return 1;
                     default:
                         if (*c) return 1;