HP-UX 10.20 support, better thread checks (ITS#1067)

[china@thewrittenword.com]

Full_Name: Albert Chin-A-Young
Version: 2.0.7
OS: HP-UX, Tru64 UNIX
URL: ftp://ftp.thewrittenword.com/outgoing/pub/openldap-2.0.7.patch
Submission from: (NULL) (216.80.72.157)


The patch below should make building on Tru64 UNIX and HP-UX 10.20 work.
It contains the following:
  0. Clean up OL_ARG_WITH (alignment issues with --help)
  1. Reintroduction of OL_FUNC_CTIME_R_TYPE and a proper autoconf
     fix
  2. Better TCP wrappers test
  3. Autoconf test for OL_BERKELEY_DB_THREAD should all the
     threading options if detected
  4. Better tests for OL_FUNC_GETHOSTBYNAME_R_NARGS and
     OL_FUNC_GETHOSTBYADDR_R_NARGS to determine the number
     of arguments each function takes. On Tru64 UNIX and HP-UX,
     gethostbyname_r takes 3 arguments.
  5. Better -lsocket and -lnsl checks