We can't initialize file handles properly a second time.

This test tests point size clamping behaviour when POINTSIZE_MAX <
POINTSIZE_MIN, but that behaviour isn't consistent between D3D drivers.

We can create a separate test for point rasterization if we really care about
that, but I doubt we do.

Some window managers don't allow minimizing dialog windows.

The previous code does not function on Snow Leopard, and does not conform
to Apple's documentation. This fix should function on all versions of OS X
later than 10.2.