This should fix compilation errors when -DGMIO_BUILD_TESTS_FAKE_SUPPORT=ON
on travis CI.
Currently travis cmake version is v2.8.7 and it does not support
the INCLUDE_DIRECTORIES target property.
fake_support allows to test compilation of gmio_support
is successful. It provides fake sources of the required
3rd party libraries (Qt and OpenCascade).
Fake sources allows to quickly check if nothing is broken
in gmio_support after API changes.
It will also be useful for CI.