Use strerror() if available.

Use a UDP socket connected to itself to allow signals to terminate the
select() in slapd_daemon_task().

to UNUSED without holding connections mutex.  It's not safe for
connection_init to check connection state until after acquires the
c_mutex.

Improve regex to allow detection of : inside of filenames.
Skip files with ':' in name
Fix noslash 'next' vs 'continue' bug

result was leaking ber's in some error cases.  ber_flush now called
with no freeing so that caller of send_ldap_ber() can free its own ber.
c->c_currentber was also being leaked if connection was destory
current when a PDU input was outstanding.
Fixed ber_flush to free ber upon write only to file.

modrdn to run,  but masks the underlying subtree index bug (which
I haven't found yet).
Apply modrdn/dn2id changes to BDB2.

Add additional abandon point to modrdn.
test005-modrdn still shows error.  Likely in dn2id, index, or idl codes.

relying on developer selecting the right goto label.

to validate input dn's BEFORE sending dn's to server.
Also fixed getfilter to use REG_EXTENDED|REG_NOSUB.  (and fixed one
case where REG_BASIC was still used).
s/strdup/LDAP_STRDUP/
Added ldap_pvt_str2lower/upper

reflect its purpose.  Modify switch to support REG_EXTENDED expressions.
Use REG_EXTENDED instead of REG_BASIC everywhere.
Modify <ac/regex.h> to support <gnuregex.h> for testing purposes.
Requires: env CPPFLAGS="-DHAVE_GNUREGEX_H=1" LIBS=-lgnuregex ./configure