Env variable LD_LIBRARY_PATH defined for QtWayland libraries

Change-Id: I066292551aaa5f80ceb0f9ddd02a77eac9022db5
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
Testconfig: Adding QMAKEFLAGS to export wayland-compositor config

Change-Id: I72541836adbc9784f1fa7613885f46f26965708e
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>