Rework handling of I/O via select() to use correct fd_set type instead of int for fd sets.

Some code that was maintaining an fd_set with only a single fd was replaced
       with just the fd as int, which can be added to the global fd_set as needed.
       More testing is required for less usual configurations such as host TCP/UDP/IP
       and direct ethernet (packet filter or NIT) I/O.

	modified:   src/common.c
	modified:   src/ether.c
	modified:   src/inet.c
	modified:   src/initkbd.c
	modified:   src/kbdsubrs.c
	modified:   src/keyevent.c
	modified:   src/main.c
	modified:   src/osmsg.c
	modified:   src/rawrs232c.c
	modified:   src/rpc.c
	modified:   src/rs232c.c
	modified:   src/tty.c
	modified:   src/uraid.c
	modified:   src/xinit.c

src/common.c

@@ -16,6 +16,7 @@ static char *id = "$Id: common.c,v 1.2 1999/01/03 02:06:52 sybalsky Exp $ Copyri
 #include <setjmp.h>
 #include <fcntl.h>
 #include <string.h> /* for memset */
+#include <sys/select.h> /* for fd_set */
 #include "lispemul.h"
 #include "lispmap.h"
 #include "adr68k.h"
@@ -45,7 +46,8 @@ error
 ******************************************************************/
 #define URMAXFXNUM 100
 
-extern unsigned int LispReadFds, LispWindowFd, LispKbdFd;
+extern fd_set LispReadFds;
+extern int LispWindowFd, LispKbdFd;
 extern struct screen LispScreen;
 extern int displaywidth, displayheight;
 extern DLword *DisplayRegion68k;