plugins: Fix usage of GST_GL_HAVE_WINDOW_* defines
When these definitions are false, they are undef in the preprocessor, not a defined value of 0. When they are unset the compile fails with: 'GST_GL_HAVE_WINDOW_WAYLAND' undeclared (first use in this function) https://bugzilla.gnome.org/show_bug.cgi?id=780948
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