update locking codes, remove old platform specific defines

include/ac/socket.h

libraries/liblber/dtest.c

libraries/liblber/etest.c

libraries/libldap/cldap.c

libraries/libldap/friendly.c

libraries/libldap/getfilter.c

libraries/libldap/open.c

libraries/libldap/result.c

libraries/libldap/test.c

libraries/libldap/tmplout.c

libraries/libldap/tmpltest.c

servers/slapd/lock.c

servers/slurpd/lock.c