This macro hasn't done anything meaningful since we stopped using really old
versions of Borland compilers (and std libraries) where strerror() returned a
string terminated with a line-feed (\n) character.

The old "illegal header length increase" error goes away and now
smb_putmsghdr() will re-allocate a header if needs to be moved to accommodate
new header fields or header fields with increase data lengths.

We can consider getting rid of the MsgBase "expand_fields" concept now.

This fixes issue #404

[s]printf format fix-ups

Likely a part 4 coming next after building with GCC.

On Win32, an off_t is 64-bits while a long is still a measly 32-bits.

write()
chsize()

This won't impact Synchronet as it has a separate signal handling
thread, but we still need to behave properly for processes that
don't.  I'm also saying that ENOMEM does not indicate a disconnection,
though it may be better to pretend it was disconnected...

so remove 'errno' value (and corresponding error strings) from generated
/logged error messages. fseek(), read(), write(), open(), etc. do set errno
to a meaningful value, so we still log errno/strerror() in those failure
cases.

and smb_incmsg_dfields(), now lock and unlock the SMB header.
This shouldprevent some mail base corruption as well as this error:
-203 (smb_incmsgdat 13 'Permission denied' reading allocation record at offset
795568) incrementing data allocation units

mode, a freeing of header or data storage at the end of the file will now
result in the file (the allocation file *and* the data/hdr file) being
truncated - saving potentially many megabytes of disk space for
non-maintained msg bases (e.g. the mail base). Previously, self-packing
and fast-alloc msg-bases would never shrink without running smbutil m,
but that's now no longer true.

Something similar could be done for hyper-alloc msgbases, but I'm not sure
that's really needed since the email base can never be hyper-allocated and
this change was really for the email msgbase where allocation files are a
must due to the multiple-recipients/headers per msg data feature.

GCC (worked fine in MSVC) :-(

Set smb.last_error strings in new voting/polling functions on failure.

If the specified or detected net_type is not Internet, only store the address
portion of the email address in the *NETADDR hfield.
If the net_type argument is a NULL pointer, automatically add the *NETTYPE
hfield too.
New functions:
- smb_netaddr_type() - returns the string/name of a specified net_type.
- smb_get_net_type_by_addr() - parses just the network address field.
Change short/ushort's to int16_t/uint16_t's.
Remove date from copyright.

The CRC headers now include gen_defs.h

same as SMB_SUCCESS).

(or any useful error number). It just returns a "non-zero" value, the same
"non-zero" value regardless of the cause of failure. Still not positive if
fread() sets errno in any/all CRTLs or not. :-(

This allows a single version of smb.lib to be linked with either single or
multi-threaded applications.

and allow for selective linking of objects from library archives.