environment: Add SSH_ASKPASS environment variable, point it to ksshaskpass

Akseli Lahtinenrequested to merge
work/akselmo/env-ssh_askpass into master

Some GUI applications such as Dolphin Git integration ask for SSH password during use. This let's those applications know what our GUI tool for it is.

If this is not set, those applications may fail and expect the user to enter the SSH key through a terminal prompt, which is not available in GUI applications.

Edited by Akseli Lahtinen

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