[LINUX5250] tn5250 patches for DOS support

[Carey Evans <careye@xxxxxxxxxxx>]

As I get time over the next few weeks, I'm going to be checking in some 
patches to tn5250 so that it can run under PC DOS and MS DOS, along with 
a few other minor changes that developed along the way.  The patches are 
against the stable b0-16 branch, and shouldn't have any effect outside 
the new files for DOS support.

The updated tn5250 compiles as a protected mode program with DJGPP, 
using Watt-32 for networking.

The first patch isn't strictly to with with DOS; it converts the 
"transmaps" program from Perl to a shell script, and adds a number of 
DOS codepages.  I also fixed the bug in recode for codepage 870 and 
regenerated transmaps.h, and so removed the hack in utility.c.  (See 
http://bugs.debian.org/270414 for the fix.)

I'll keep the mailing list updated as I check in further changes.

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