Cygwin: console: Disable xterm mode for non cygwin process only.

- Special function keys such as arrow keys or function keys do not
  work in ConEmu with cygwin-connector after commit
  6a06c6bc8f. This patch fixes the
  issue.

winsup/cygwin/fhandler_console.cc

@@ -33,17 +33,6 @@ details. */
 #include "child_info.h"
 #include "cygwait.h"
 
-/* Not yet defined in Mingw-w64 */
-#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
-#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
-#endif /* ENABLE_VIRTUAL_TERMINAL_PROCESSING */
-#ifndef DISABLE_NEWLINE_AUTO_RETURN
-#define DISABLE_NEWLINE_AUTO_RETURN 0x0008
-#endif /* DISABLE_NEWLINE_AUTO_RETURN */
-#ifndef ENABLE_VIRTUAL_TERMINAL_INPUT
-#define ENABLE_VIRTUAL_TERMINAL_INPUT 0x0200
-#endif /* ENABLE_VIRTUAL_TERMINAL_INPUT */
-
 /* Don't make this bigger than NT_MAX_PATH as long as the temporary buffer
    is allocated using tmp_pathbuf!!! */
 #define CONVERT_LIMIT NT_MAX_PATH
@@ -2975,14 +2964,6 @@ fhandler_console::fixup_after_fork_exec (bool execing)
 {
   set_unit ();
   setup_io_mutex ();
-  if (wincap.has_con_24bit_colors () && !con_is_legacy)
-    {
-      DWORD dwMode;
-      /* Disable xterm compatible mode in input */
-      GetConsoleMode (get_handle (), &dwMode);
-      dwMode &= ~ENABLE_VIRTUAL_TERMINAL_INPUT;
-      SetConsoleMode (get_handle (), dwMode);
-    }
 }
 
 // #define WINSTA_ACCESS (WINSTA_READATTRIBUTES | STANDARD_RIGHTS_READ | STANDARD_RIGHTS_WRITE | WINSTA_CREATEDESKTOP | WINSTA_EXITWINDOWS)