autoconf test for libV3 not needed (ITS#1542)

[china@thewrittenword.com]

Full_Name: Albert Chin-A-Young
Version: 2.0.21
OS: HP-UX 10.20, 11.00
URL: ftp://ftp.thewrittenword.com/outgoing/pub/openldap-2.0.21-1.patch
Submission from: (NULL) (64.32.187.114)


The autoconf test:
  dnl HP-UX requires -lV3
  AC_CHECK_LIB(V3, sigset)
is deprecated with HP-UX 11.00 and is useless under HP-UX 10.20. Considering
that OpenLDAP doesn't even build on 10.20 (not yet anyway), this check can be
safely removed.

Patch at:
  ftp://ftp.thewrittenword.com/outgoing/pub/openldap-2.0.21-1.patch