Attempt at a glibc recipe

This doesn't completely work, so please don't merge it. I just wanted to have a point of reference for a discussion about how we can make a `glibc` recipe to avoid issues like #43.

If I take out the `make check` from the recipe, it gives the illusion of working, but then any of the libraries that link against `glibc` give me segfaults, so obviously something is going slightly awry.