Clean up macosx-toolchain config file
We should figure out whether CC etc. still needs to get set in the
config file of the macosx-toolchain project. Chances are high that
this can get cleaned up given that a lot of projects get the necessary
info from rbm.conf's configure_opt and for Firefox we have its
mozconfig file.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information