'make bdb2' tests only BDB2
'make ldbm' tests only LDBM
Fix up scripts (previous changes broke BDB2 testing)

Remove disable write sync (dbcachenowsync) in master (for concurrency test).

suggested by Gerrit Thomson

Move Debug messages outside of c_mutex.  Other LDBM cache codes
also should be streamlined.  Resultant approaches should then
be applied to back-bdb2.

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

clients).

because it's already done in ldbm_nextkey().

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.

Move all SunOS routines (ie: _sleep() and its helpers) to thr_lwp.c
so that it's internals can be 'static'.  Add 'static' to thr_lwp.c.
Add comment to LWP:  NEEDS WORK, may not compile!  Need some
SunOS user to sort out the details.  Volunteers?

need to be managed completely by -lldap_r.