MAINT: Reverted to using previous freetype version

**Test PR only** - not for merging

This may not be the best way of achieving this, however if using matplotlib from conda, we are stuck with it install freetype from there as far as I'm aware, so defining the LD_LIBRARY_PATH allows matplotlibs ft2font.so use the systems freetype instead.

Open to suggestions on better approaches.

Await to see if this passes on Travis, passes on my desktop.