replace 3 files and add 1 prototype

Changes to be committed:
	modified:   include/extern.h
	modified:   src/apply.c
	modified:   src/sys.c
	modified:   win/tty/wintty.c

The 3 files appeared to be missing sections. The erronoeous
versions have been emailed to the win32 team to determine
their fate.

Adds a missing prototype also.

src/sys.c

@@ -1,4 +1,5 @@
 /* NetHack 3.5	sys.c	$NHDT-Date: 1426544797 2015/03/16 22:26:37 $  $NHDT-Branch: master $:$NHDT-Revision: 1.18 $ */
+/* NetHack 3.5	sys.c	$Date: 2012/03/10 02:22:07 $  $Revision: 1.12 $ */
 /* Copyright (c) Kenneth Lorber, Kensington, Maryland, 2008. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -11,6 +12,7 @@
 /* # define DEBUGFILES "*" */
 /* note: DEBUGFILES value here or in sysconf.DEBUGFILES can be overridden
    at runtime by setting up a value for "DEBUGFILES" in the environment */
+#endif
 
 struct sysopt sysopt;