Fix prototype syntax for functions with no parameters in include files

Add some overlooked function prototypes  to xxxdefs.h include files
Add missing #include of relevant xxxdefs.h in a couple of source files
Add prototypes in standalone programs to silence (some) -Wmissing-prototype warnings
Remove duplicate prototype from hardrtn.c

	modified:   inc/commondefs.h
	modified:   inc/dirdefs.h
	modified:   inc/dspifdefs.h
	modified:   inc/dspsubrsdefs.h
	modified:   inc/etherdefs.h
	modified:   inc/gcmain3defs.h
	modified:   inc/initdspdefs.h
	modified:   inc/initkbddefs.h
	modified:   inc/keyeventdefs.h
	modified:   inc/maindefs.h
	modified:   inc/osmsgdefs.h
	modified:   inc/testtooldefs.h
	modified:   inc/timerdefs.h
	modified:   inc/unixfork.h
	modified:   inc/uraiddefs.h
	modified:   inc/vmemsavedefs.h
	modified:   inc/xcursordefs.h
	modified:   inc/xlspwindefs.h
	modified:   src/arith2.c
	modified:   src/ether.c
	modified:   src/hardrtn.c
	modified:   src/keytstno.c
	modified:   src/setsout.c
	modified:   src/tstsout.c

src/ether.c

@@ -67,6 +67,7 @@ static char *id = "$Id: ether.c,v 1.4 2001/12/24 01:09:02 sybalsky Exp $ Copyrig
 #include "adr68k.h"
 #include "ether.h"
 #include "dbprint.h"
+#include "etherdefs.h"
 
 #ifdef USE_DLPI
 #define NIOCSETF PFIOCSETF