Fix building tests with Windows

Hi,

The latest GIT master of cairomm needed some updates so that tests will build with Windows, namely:

• The test-font-face.cc needed updates like commit 715d9dd9 for the Windows bits as well.
• Some test code that built when CAIRO_HAVE_FT_FONT is defined does not build because CAIRO_HAVE_FC_FONT is assumed, so check for CAIRO_HAVE_FC_FONT as well.
• NMake Makefiles need to be updated
• Use Boost's BOOST_AUTO_TEST feature so that things are easier when one wants to build against shared builds of Boost::Test.

The changes can be found at the fix-tests-windows branch of my fork of the cairomm repository, at https://gitlab.freedesktop.org/fanc999/cairomm.git.

With blessings, thank you!