pkexec : patch for safe "--keep-user-env" option

[Jean-Philippe Guillemin]

Hi,
Many X applications require root privileges, but at the same time want to
keep the original $USER env variable.

This option (see attached patch), while preserving the
sanitized environment, and also while still honoring the
org.freedesktop.policykit.exec.allow_gui annotate key : allow the user to
preserve the $USER environment variable.

I believe, this option is both safe, clean, and a must have for pkexec.

All the best

JP
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