Fixes for GPG pinentry issue with git gui

[ieugen]

Closes #221

[joshrabinowitz]

Thanks for the patch, @ieugen ! Does this fix your --pinentry issue?

Unfortunately it breaks the git-secret self-tests.
If this does fix your pinentry issue, we need to find the right condition under which to avoid the --pinentry-mode loopback option

[joshrabinowitz]

Hey @ieugen, ok with you if I close this PR? Issue #221 still tracks the problem.

[joshrabinowitz]

Hello @ieugen , I think I've worked up a solution for this issue.

Could you possibly test issue #221 along with the code from PR #490
with the env var SECRETS_PINENTRY set to default and then ask?
I think one or both will allow gpg-agent to use its normal pinentry method.

Please let us know if it works or not, if you get a chance to test it! Thank you.