termcap moodule problem on Cygwin

["Andrej Borsenkow" <Andrej.Borsenkow@mow.siemens.ru>]

Cygwin has only static libtermcap. It gets linked twice - into main zsh
(libzsh to be sure) where term is (re-)initalized and into termcap.dll where
bin_echotc is defined. Only first one calls tgetent() so every call to `echotc
cap' crashes somewhere in termcap.

Calling tgetent in bin_echotc is not an option because it won't catch changed
TERM. It means that code to deal with terminal should exist exactly once - in
main zsh or in module. I vote for moving it into zle (after all, it is the
only module that should care for TERM) together with bin_echotc. In any case,
it makes idea of echotc in seperate module very questionable.

Note, that Cygwin is not the only system with static termcap/terminfo.

-andrej

Have a nice DOS!
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