Add newline when printing auth/connection failure string to stderr

Merged Julien Cristau requested to merge jcristau/libxcb:stderr-newline into master

The reason strings returned by the server don't all include a newline, so make sure we add one to avoid confusing clients. Xlib used to do this before it delegated that work to libxcb.

Fixes #34 (closed)

Signed-off-by: Julien Cristau

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