[PATCH] Check for GPG_TTY as well as DISPLAY.

[Ben Kibbey]

Hello,

There doesn't seem to be a way to set the tty for a pinentry to prompt
on in gpgme if isatty() fails (daemon process). This patch uses the
GPG_TTY environment variable as the value of --ttyname when set, and the
value of ttyname_r() if not.

OK to push?

-- 
Ben Kibbey
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