internal atexit handler.

Clean up headers.

Calls to gai_strerror() should be replaced with calls AC_GAI_STRERROR().

s/LDAP_PF_UNIX/LDAP_PF_LOCAL/
s/AF_UNIX/AF_LOCAL/
s/PF_UNIX/PF_LOCAL/

macros into our namespace and limit use to headers.  A subsequent
round will add macros to separately handle forward declarations
of variables from declaration of function prototypes.  The last
round will add additional macros for declaring actual variables and
functions.

ber_pvt_wsa_err2string.

support for DCE slash-delimited, left-to-right DNs;
support for a domain socket transport (enable with
--enable-ldapi); and extensions to URL parsing to
support the latter transport.

tcp_read/write should not be used.

manual push bytes about.  Allows ber_*_t to be any 32-bit or
larger type.  Reworked AC_{HTON,NTOH}{L,S} macros to care only
about 32-bit (netlong) and 16-bit (netshort) reordering as
needed for BSD socket interface.

See README 1.27 log

instead of WSAGetLastErrorString to preserve errno like semantics.

errno.

Use strerror() if available.

Update res_search check and place behind --enable-dns.