* gtk+-2/pinentry-gtk-2.c (create_window): Do not setup
the backspace handler when prompting for a PIN.
callback only when not prompting for a PIN.
* qt/pinentrydialog.h (_got_input): Rename field to
_disable_echo_allowed.
* qt/pinentrydialog.cpp (PinEntryDialog::setPrompt): Disallow
echo disabling when prompting for a PIN.
* tqt/pinentrydialog.h (_got_input): Rename field to
_disable_echo_allowed.
* tqt/pinentrydialog.cpp (PinEntryDialog::setPrompt): Disallow
echo disabling when prompting for a PIN.