Commits on Mar 24, 2023

1. check-meta.nix: fix self-contradictory error messages …

   See #222792 (review)
   
   You can't just `lib.filter _ lib.systems.all` -- that throws away
   important information, leading to nixpkgs disagreeing with itself
   like this:
   
   ```
   $ NIXPKGS_ALLOW_BROKEN=1 nix-instantiate . -A pkgsStatic.systemd
   error: Package ‘systemd-252.5’ in ... is only supported on ... x86_64-linux but not on requested x86_64-linux, refusing to evaluate.
   ```
   
   After:
   
   ```
   $ NIXPKGS_ALLOW_BROKEN=1 nix-instantiate . -A pkgsStatic.systemd
   error: Package ‘systemd-252.5’ in ... is not available on the requested hostPlatform:
            hostPlatform.config = "x86_64-unknown-linux-musl"
            package.meta.platforms = [
              "aarch64-linux"
              "armv5tel-linux"
              "armv6l-linux"
              "armv7a-linux"
              "armv7l-linux"
              "i686-linux"
              "m68k-linux"
              "microblaze-linux"
              "microblazeel-linux"
              "mipsel-linux"
              "mips64el-linux"
              "powerpc64-linux"
              "powerpc64le-linux"
              "riscv32-linux"
              "riscv64-linux"
              "s390-linux"
              "s390x-linux"
              "x86_64-linux"
            ]
            package.meta.badPlatforms = [
              {
                isStatic = true;
                parsed = { };
              }
            ]
          , refusing to evaluate.
   ```

   Adam Joseph committed Mar 24, 2023
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