recipes-archive-melpa: fix incorrect source hashes

Here is how I produce this patch:
1. Cherry-pick the update[1] to my system's Nixpkgs commit to avoid
building many staging packages
2. Build sources for each elisp package set denoted as EPKGS.  EPKGS
can be elpaDevelPackages, elpaPackages, nongnuPackages,
melpaStablePackages and melpaPackages.
   nix build --include nixpkgs=$PWD --file source-hash.nix EPKGS --keep-going
3. Check log for hash mismatch:
   error: hash mismatch in fixed-output derivation '/nix/store/lg6jmfbqmkp261dwk25ji9n8sxd180rm-source-vhdl-tools-20200330.1819.drv':
         specified: sha256-QsEah0IR5qIEv4Wng9VAfyBB47UC9SwoVfsGjvcbUz0=
         got:    sha256-RMEah0IR5qIEv4Wng9VAfyBB47UC9SwoVfsGjvcbUz0=
4. Convert the correct hash if needed
   nix hash to-base32 sha256-RMEah0IR5qIEv4Wng9VAfyBB47UC9SwoVfsGjvcbUz0=

Here is the content of source-hash.nix:

```nix

let
  pkgs = import <nixpkgs> { };
  lib = pkgs.lib;
  mkSrcSet =
    epkgs:
    lib.mapAttrs (
      name: package: package.src.overrideAttrs { name = "source-" + name + "-" + package.version; }
    ) (lib.filterAttrs (_: package: lib.isDerivation package && (package ? src)) epkgs);
in
{
  elpaDevelPackages = mkSrcSet pkgs.emacsPackages.elpaDevelPackages;
  elpaPackages = mkSrcSet pkgs.emacsPackages.elpaPackages;
  nongnuPackages = mkSrcSet pkgs.emacsPackages.nongnuPackages;
  melpaStablePackages = mkSrcSet pkgs.emacsPackages.melpaStablePackages;
  melpaPackages = mkSrcSet pkgs.emacsPackages.melpaPackages;
}

```

[1]: https://github.com/NixOS/nixpkgs/pull/308258

0 files changed, 0 insertions, 0 deletions