dependencies: Centralize aws-sdk-cpp and sync with Nixpkgs

By syncing with Nixpkgs, we reuse the same derivation, which is
generally a good idea, and has the benefit that it is transitively
a channel blocker.

Changes:

- https://github.com/NixOS/nixpkgs/pull/163313 (SuperSandro2000)

  > nix: disable big-parallel for aws-sdk-cpp

  > aws-sdk-cpp only takes ~1m52s on a 4 core machine under 50% load
  > which does not justify the requirement on big parallel.

  > Tested with `nix-build -A nixVersions.nix_2_6.aws-sdk-cpp`.

  > I can finally build nix without requiring a big-parallel machine.

- https://github.com/NixOS/nixpkgs/pull/227506 (Artturin)

  > nix: use [ ] instead null to empty requiredSystemFeatures

  > fixes 'error: value is null while a list was expected' with 'nixpkgs.hostPlatform.gcc.arch = "x86_64";'

package.nix

@@ -237,10 +237,7 @@ in {
     ++ lib.optional stdenv.hostPlatform.isx86_64 libcpuid
     # There have been issues building these dependencies
     ++ lib.optional (stdenv.hostPlatform == stdenv.buildPlatform && (stdenv.isLinux || stdenv.isDarwin))
-      (aws-sdk-cpp.override {
+      aws-sdk-cpp
-        apis = ["s3" "transfer"];
-        customMemoryManagement = false;
-      })
   ;
 
   propagatedBuildInputs = [

packaging/dependencies.nix

@@ -79,6 +79,15 @@ scope: {
   inherit stdenv versionSuffix;
   version = lib.fileContents ../.version + versionSuffix;
 
+  aws-sdk-cpp = (pkgs.aws-sdk-cpp.override {
+    apis = [ "s3" "transfer" ];
+    customMemoryManagement = false;
+  }).overrideAttrs {
+    # only a stripped down version is built, which takes a lot less resources
+    # to build, so we don't need a "big-parallel" machine.
+    requiredSystemFeatures = [ ];
+  };
+
   libseccomp = pkgs.libseccomp.overrideAttrs (_: rec {
     version = "2.5.5";
     src = pkgs.fetchurl {

src/libstore/package.nix

@@ -66,10 +66,7 @@ mkMesonDerivation (finalAttrs: {
   ] ++ lib.optional stdenv.hostPlatform.isLinux libseccomp
     # There have been issues building these dependencies
     ++ lib.optional (stdenv.hostPlatform == stdenv.buildPlatform && (stdenv.isLinux || stdenv.isDarwin))
-      (aws-sdk-cpp.override {
+      aws-sdk-cpp
-        apis = ["s3" "transfer"];
-        customMemoryManagement = false;
-      })
   ;
 
   propagatedBuildInputs = [