agent: Keep the session environment for restricted connections.
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Description

agent: Keep the session environment for restricted connections.

* agent/command-ssh.c (setup_ssh_env): Move code to ...
* agent/gpg-agent.c (agent_copy_startup_env): .. new function.  Change
calllers.
* agent/command.c (start_command_handler): Call that fucntion for
restricted connections.

A remote connection is and should not be able to setup the local
session environment. However, unless --keep-display is used we would
be left without an environment and thus pinentry can't be used. The
fix is the same as used for ssh-agent connection: We use the default
environment as used at the startup of the agent.