* configure.in: Added better check for libwrap (the old way failed when

* configure.in: Added better check for libwrap (the old way failed when
  libwrap was a dynamic library). Added -lwrap to new subst var WRAP_LIBS
  so we have more control over where it get's linked (dynamic libwrap
  causes problems when we link to programs that don't define certains
  globals that libwrap expects).
* build/top.mk: Added placeholder for WRAP_LIBS subst
* servers/slapd/Makefile.in: Added $(WRAP_LIBS) to the slapd and sslapd
  link command line specifically so it doesn't get thrown in with the rest
  of the LIBS.
* configure: rebuilt