Fix printf formats, remove unused variables, add missing prototypes in slapd,
add static/const, add some return types or change to void return type.

Also fix debug_printf macro when !LDAP_DEBUG: It did not take arguments.

to build OpenLDAP.

should have been.

provide prototype in lutil.h
use LBER_SOCKET_T instead of int in prototype.  (didn't use
	ber_socket_t so all of lber.h wouldn't have be dragged in)
rename signal handlers, use RETSIGTYPE, and make SIGHUP wake
rename fd to sd to reflect descriptor must be usable as a socket.
renamed sel_exit_fds to wake_sds to reflect current use
improve readability of sockpeer.c including removing obtuse goto.

not assume LDAP_SIGUSR2