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xwayland/launcher: Prevent file descriptor leak

Michael Labiuk requested to merge shanechko/kwin:closingDescriptorsXwayland into master

Compositor keeps descriptors opened for XWayland process.

Descriptors are opened for passing to Xwayland process and does not have close_on_exec attribute.

Descriptors leaks to application started by global hotkey. For example start konsole in wayland session by ctrl+alt+T hotkey and run command ls -l /proc/self/fd to show leaked descriptors.

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