Int21 : Dont reset systematically CFLAG

[Jukka Heinonen]

Sylvain Petreolle wrote:
> Dont reset systematically CFLAG when calling the int 21 handler.
> Some functions dont change it.

This patch must not be applied because it is highly likely
that it will break almost all DOS programs.

Fix itself is correct but before this patch can be applied
it must be made sure that all functions that are supposed
to reset CFLAG really reset it.

-- 
Jukka Heinonen <http://www.iki.fi/jhei/>