Add Client32 NCP support for FLAG and FLAGDIR

Implement a working DOS Client32 NCP87 path using the NIOS resolver,
CONNOpenByReference and COMPATNcpRequestReply.

Add an initial FLAGDIR implementation for NetWare 386-style directory
attributes.  Support Normal, System, Hidden, Delete Inhibit, Purge and
Rename Inhibit, using the same Client32 NCP87 modify/read helpers.  Match
the Novell FLAGDIR display style more closely for simple mapped paths.

Also add/keep minimal TESTS coverage for the verified Client32 NCP87
attribute path.

CMakeLists.txt

@@ -25,6 +25,7 @@ set(MARS_DOSUTILS_PUBLIC_TOOLS
     logout
     slist
     flag
+    flagdir
     capture
     endcap
 )
@@ -44,6 +45,7 @@ if(MARS_NWE_BUILD_DOSUTILS)
         map.c
         slist.c
         flag.c
+        flagdir.c
         c32ncp.c
         nwcrypt.c
         nwdebug.c