chickenPackages.chickenEggs: Preserve version info

Most eggs in the canonical repository don't declare a `version` property in their `.egg` files. This
is because it's provided implicitly when using `chicken-install` to retrieve them. Quoting from [the
manual](https://wiki.call-cc.org/man/5/Egg%20specification%20format#version):

> Eggs from remote egg servers are automatically versioned - the version is part of the protocol to
retrieve the egg and does not have to be specified in the .egg file.

Since we don't use `chicken-install` to retrieve eggs, this leaves us with a version of "unknown" in
most cases, e.g.:

    $ nix-shell -p chickenPackages.chickenEggs.json-abnf chickenPackages.chicken --run chicken-status
    abnf ...................................................... version: unknown
    iset ...................................................... version: unknown
    json-abnf ................................................. version: unknown
    lexgen .................................................... version: unknown
    regex ......................................................... version: 2.0
    srfi-1 .................................................... version: unknown
    srfi-127 .................................................. version: unknown
    srfi-69 ................................................... version: unknown
    utf8 ...................................................... version: unknown

This is usually not an issue unless another egg declares a minimum required version dependency on an
egg with missing version info. In this case, `chicken-install` will fill in "0.0.0" as a fallback
and the check will fail. This has so far been worked around patches (see e.g. #346004 or #358455).

This patch addresses the root cause by following the documentation's recommendation:

> Eggs installed from local directories (see below) should explicitly specify a version.

To do that, `eggDerivation` now simply always adds the version to the generated `.egg-info`
file. This has the added benefit of correcting potentially inconsistent version declarations in
`.egg` files. Note that we cannot patch the original `.egg` file because not all released egg
versions match [the stricter version format validation which currently applies
there](https://bugs.call-cc.org/ticket/1855).

The patch also changes the signature of `eggDerivation` to allow passing in `pname` and `version`
instead of `name` to allow for easy access to the egg version. However, for backwards compatibility,
the old `name` argument is also still supported.

As a result, the aforementioned overrides are removed again and some additional eggs can be marked
as unbroken again.

And finally, this is the output of the above `chicken-status` call with the patch applied:

    $ nix-shell -p chickenPackages.chickenEggs.json-abnf chickenPackages.chicken --run chicken-status
    abnf .......................................................... version: 8.3
    iset .......................................................... version: 2.2
    json-abnf ..................................................... version: 7.0
    lexgen ........................................................ version: 8.2
    regex ......................................................... version: 2.0
    srfi-1 ...................................................... version: 0.5.1
    srfi-127 ...................................................... version: 1.3
    srfi-69 ..................................................... version: 0.4.3
    utf8 ........................................................ version: 3.6.3

0 files changed, 0 insertions, 0 deletions