[Info-vax] Building latest C-Kermit under OpenVMS gives errors

[Steven Schweda]

   Changes which should clear the problems involving MAXPATHLEN, and
some other lame code, and restore the VMS-specific functions missing
from ckvfio.c (again):

      http://antinode.info/ftp/kermit/v9r0_305_Alpha04/
      ftp://antinode.info/kermit/v9r0_305_Alpha04/

   The v9r0_305_Alpha04 ckvker.com has changes which are not all bad,
and I haven't merged it yet, but the v9r0_305_Alpha02/ckvker.com should
work for now.  When I get bored, ...

   The (my) original expectation was that all uses of MAXPATHLEN would
be replaced by CKMAXPATH, but I failed to make the required changes to a
couple of files which weren't used on VMS.  And then someone added more
uses of MAXPATHLEN, rather than CKMAXPATH, to code which _is_ used on
VMS.

   The SSL stuff still has problems.  I haven't looked closely at why,
but it seems to want X509_CRL_get0_nextUpdate(), which, so far as I can
tell, was new in OpenSSL 1.1.1, so a LINK with an older OpenSSL run-time
gets a %ILINK-I-UDFSYM.  But OpenSSL 1.1.1 makes a bunch of structures
opaque, so compilation using the modern header files gets many
%CC-W-INCOMPDEREF and %CC-E-NEEDMEMBER where the code expects to fiddle
directly with those structures.  Someone who knows more about OpenSSL
than how to build it might need to look into that.