Replaced u_ with unsigned.

(MAX_NO_OF_CONNECTIONS): Now initialized by main() if HAVE_SYSCONF or
	HAVE_GETDTABLESIZE is defined.

(get_real_username): Test HAVE_LIBAUTHUSER instead of RFC_931.

Replaced u_ with unsigned.
(restart_kom): Use getcwd() (which is POSIX) to get
	the current working directory. Fall back on getwd() if getcwd() is
	not available.
(main): Use sysconf(_SC_OPEN_MAX) instead of
	getdtablesize(), if available.

Replaced u_ with unsigned.

(prot_a_is_legal_fnc): call_fnc_shutdown is renamed to call_fnc_shutdown_kom.

Added comments to declaration of EMPTY_CONNECTION.

Replaced u_ with unsigned.

Renamed shutdown to shutdown_kom.

Don't try to set SO_DONTLINGER if SO_DONTLINGER is undefined.
Use O_NONBLOCK instead of FNDELAY if FNDELAY is undefined.

Don't try to set SO_DONTLINGER if SO_DONTLINGER is undefined.
Use O_NONBLOCK instead of FNDELAY if FNDELAY is undefined.

Fall back to O_NONBLOCK if FNDELAY is undefined.

(parse_env): Always declare it, even if _JBLEN is
	undefined. (Not all versions of <setjmp.h> defines _JBLEN).

	avoid name clashes with libc.

LysKOM environment.

Fixed "make clean" target.

running SunOS 4.1.3, and *almost* on Linux.