[LINUX5250] Re: tn5250 patches for DOS support

[Carey Evans <careye@xxxxxxxxxxx>]

At last, I've checked in the second stage of my patches for DOS support. 
 This cleans up a few bits of existing code, removing unused prototypes 
from session.c, using an anonymous rather than a dummy struct in 
terminal.h, and using #error in utility.h.  I also extended the WIN32 
#ifdefs in utility.c to MSDOS as well.

The only functional change is to call tn5250_stream_disconnect(stream) 
in tn5250.c when exiting.  Otherwise, we leak our reference to the 
socket FD, and the socket is only closed when the program ends.  Watt-32 
on DOS aborts the connection with a single RST packet in that case.

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