Win32 cmake msvc16 64 bit native and mingw32/64 4.8.3 cross compile fix.

This patch fixes a "missing include directory" compile error on test-print build target.

Bug: http://lists.freedesktop.org/archives/dbus/2014-August/016260.html
Reviewed-by: rony@wu.ac.at
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>