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/arith2.c

@@ -20,6 +20,7 @@ static char *id = "$Id: arith2.c,v 1.4 2001/12/24 01:08:58 sybalsky Exp $ Copyri
 #include "medleyfp.h"
 #include "arith.h"
 
+#include "arith2defs.h"
 #include "fpdefs.h"
 #include "mkcelldefs.h"
 

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

src/hardrtn.c

@@ -51,7 +51,6 @@ static FX *make_FXcopy(register FX *fx68k) {
   int nametbl_on_stk = NIL;
   register DLword *new68k;
   register Bframe *retbf68k;
-  extern DLword *freestackblock(DLword n, StackWord * start68k, int align);
 
 #ifdef FLIPCURSOR
   flip_cursorbar(5);

src/keytstno.c

@@ -13,4 +13,7 @@ static char *id = "$Id: keytstno.c,v 1.3 1999/05/31 23:35:36 sybalsky Exp $ Copy
 
 #include "version.h"
 
-int keytester(void) { return 0; }
+int keytester(void);
+int keytester() {
+    return 0;
+}

src/setsout.c

@@ -44,6 +44,7 @@ static char *id = "$Id: setsout.c,v 1.3 1999/05/31 23:35:41 sybalsky Exp $ Copyr
 extern int errno;
 
 /* JDS protoize char *valloc(size_t); */
+void set_sysout(int version, char *sysout_file_name);
 
 void set_sysout(int version, char *sysout_file_name) {
   int sysout;    /* SysoutFile descriptor */

src/tstsout.c

@@ -36,6 +36,7 @@ static char *id = "$Id: tstsout.c,v 1.3 1999/05/31 23:35:44 sybalsky Exp $ Copyr
 extern int errno;
 
 /* JDS protoize char *valloc(size_t); */
+void check_sysout(char *sysout_file_name);
 
 void check_sysout(char *sysout_file_name) {
   int sysout; /* SysoutFile descriptor */