[xcb] Fix build failure

Build failure was introduced by 9bb634a6176c639bd6b52d58151e9927c30919d0.

When linking with systems provided libxkbcommon, then DFLT_XKB_CONFIG_ROOT
can't be accessed directly.

The reason that this slip through CI is that on CI machines Qt
is build with bundled version of libxkbcommon.

In addition this patch improves keymap error message, by making it more explicit for
users what could be the reasons for "keymap compilation" failures and what should
be done to make input work. As it turns out this is a common issue on old systems,
servers and some VNC clients.

Task-number: QTBUG-37971

Change-Id: I77667a404150ee7ab8465a065e23ca5eea63c33b
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

0 files changed, 0 insertions, 0 deletions