Prevent users from installing matplotlib and freetype 2.11.0 in the same environment until we can figure what's triggering AnacondaRecipes/freetype-feedstock#3.
Superseded by #150; we don't know that this incompatibility is limited to matplotlib, so let's just yank freetype 2.11.0 for Windows until we've identified the underlying issue.
Prevent users from installing matplotlib and freetype 2.11.0 in the same environment until we can figure what's triggering AnacondaRecipes/freetype-feedstock#3.