Reduce local configure script's work by removing static defines and header and

Reduce local configure script's work by removing static defines and header and
function info available in krb5/autoconf.h.

* gethostname.c, getst.c, kadm_net.c, klog.c, kparse.c: Include
krb5/autoconf.h.
* kuserok.c, log.c, memcache.c, mk_preauth.c, netread.c: Ditto.
* netwrite.c, put_svc_key.c, recvauth.c, send_to_kdc.c: Ditto.
* tkt_string.c: Ditto.
* Makefile.in: Update dependencies.
(DEFINES): Define KRB4_USE_KEYTAB.
* configure.in: Don't define KRB4_USE_KEYTAB.  Don't check for any headers or
functions; include/configure.in already does it.  Don't invoke AC_C_CONST
explicitly; CONFIG_RULES does that.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@15230 dc483132-0cff-0310-8789-dd5450dbe970