WinRt: simplify project file path retrieval

Change-Id: If2542b0c22728ae2567e4d42de3a7f7d6830c350
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
WinRt: remove unused includes

Change-Id: I7091cdf8e8bed73cdef186f826fea72c050844d5
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>