ESC accelerator support in pinentry-gtk-2

[Yuri D'Elia]

Hi everyone. I was having a look at this Debian bug entry:

   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=516489

ie: ESC does not trigger cancel (which is kind of expected in all dialogs).

I checked out the sources from git and prepared the attached patch.
It seems like that pinentry-gtk had already this behavior, but got lost 
in gtk-2.

Bests.
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