no PRs at FreeType's github mirror

[Werner LEMBERG]

FYI: I've just activated

  Setting
    Moderation Options
      Limit to repository collaborators

which is, according to
https://stackoverflow.com/questions/27957454/how-to-disable-pull-requests-in-github,
the only possibility to disable PRs on github.

Note that this setting is limited to six months and cannot be disabled
permanently.


    Werner