So in php we have a bootstrapping composer (that lives in
composer-phar.nix) that downloads the binary distribution of composer
to be able to bootstrap and build a composer built from source.
However, it's desirable to keep composer updated at all time, and this
includes the phar one that isn't used by users directly. So this makes
sure we don't "forget" about the phar one since it now borrows the
version from the source version. However, then it also made sense to
move the hash for the phar to the same file as the source
composer. Then we can control the full upgrade life cycle of both the
phar and source versions of composer from the same file.
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