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/initkbd.c

@@ -18,6 +18,7 @@ static char *id = "$Id: initkbd.c,v 1.2 1999/01/03 02:07:09 sybalsky Exp $ Copyr
 #endif
 #ifndef DOS
 #include <sys/file.h>
+#include <sys/select.h>
 #endif /* DOS */
 #ifdef SUNDISPLAY
 #include <sundev/kbd.h>
@@ -135,7 +136,7 @@ extern int errno;
 int DebugKBD = NIL;
 FILE *KBlog;
 
-u_int LispReadFds = 0;
+extern fd_set LispReadFds;
 #ifdef SUNDISPLAY
 struct inputmask LispEventMask;
 #endif /* SUNDISPLAY */