* cygwin/external.cc (cygwin_internal): Implement CW_SET_DOS_FILE_WARNING.

* cygwin/include/sys/cygwin.h: Define CW_SET_DOS_FILE_WARNING.
* utils/mount.cc (main): Turn dos file warnings off since we know what we're
doing.

winsup/cygwin/external.cc

@@ -350,6 +350,13 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	return 0;
       case CW_CYGTLS_PADSIZE:
 	return CYGTLS_PADSIZE;
+      case CW_SET_DOS_FILE_WARNING:
+	{
+	  extern bool dos_file_warning;
+	  dos_file_warning = va_arg (arg, int);
+	}
+	break;
+
       default:
 	break;
     }