Cleanup perl detection.

on errno not getting changed by Debug().  Likely a problem elsewhere.
Tests run okay, excepting concurrency has "no such object" problems.

and, if LinuxThreads, pthread_kill_other_threads_np().

(but not sure if it's usable yet).  Needs to be tested on various versions
of Linux native LinuxThreads.

	make all
	make TMPROOT=/tmp/root install
will install everything under $(TMPROOT)$(prefix).  Useful for
building bundling packages/ports for various operating systems.

support.  Will submit this to autoconf maintainers...

macro definition. If the declaration errors, then we don't declare it in
ac/string.h

after LN_S test.  Moved to openldap.m4 and cached result.
Does not yet handle case where LN_H == 'cp' and LN_S == 'ln'.

  -- fixed gethostbyaddr_r/gethostbyname_r compile warnings
  -- relocated Pthread -mt test to be before -kthread test

Change default to cc instead of gcc (experimental change).

Patch to support to determine the number of args of the
gethostby{name,addr}_r functions.
Contributed by Juan Carlos Gomes IT#68 (apparently).

Also includes support for detecting ssleay in configure.in.