Fixes DOS_ReadFile/DOS_GetSTDINStatus when reading from STDIN with extended keypresses (like Alt-X). GetSTDINStatus should check for a second byte in the extended keypress.
This fixes Wing Commander 3:
http://vogons.zetafleet.com/viewtopic.php?t=8222
Patch for INT21/AH=0C
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Added to cvs by wd.