Tests/Contracts: Fix failing VTK Contract test

This test was failing because it was attempting to build VTK in the
wrong directory.
Merge topic 'vtk-contract' into next

ca9e117 Tests/Contracts: Fix failing VTK Contract test
Windows: Use wide-character system APIs

Make CMake compile with -DUNICODE.  Make it possible for the 8 bit
encoding to eventually be UTF-8 instead ANSI.
Merge topic 'unicode-win32-apis' into next

0b9906c Windows: Use wide-character system APIs