Deduplicate our many package.nix a bit (#11175)

- They should all be built in parallel

- They should all use strict deps by default

packaging/dependencies.nix

@@ -63,9 +63,16 @@ let
 
   # Work around weird `--as-needed` linker behavior with BSD, see
   # https://github.com/mesonbuild/meson/issues/3593
-  bsdNoLinkAsNeeded = finalAttrs: prevAttrs: lib.optionalAttrs stdenv.hostPlatform.isBSD {
-    mesonFlags = [ (lib.mesonBool "b_asneeded" false) ] ++ prevAttrs.mesonFlags or [];
-  };
+  bsdNoLinkAsNeeded = finalAttrs: prevAttrs:
+    lib.optionalAttrs stdenv.hostPlatform.isBSD {
+      mesonFlags = [ (lib.mesonBool "b_asneeded" false) ] ++ prevAttrs.mesonFlags or [];
+    };
+
+  miscGoodPractice = finalAttrs: prevAttrs:
+    {
+      strictDeps = prevAttrs.strictDeps or true;
+      enableParallelBuilding = true;
+    };
 
 in
 scope: {
@@ -136,8 +143,14 @@ scope: {
 
   inherit resolvePath filesetToSource;
 
-  mkMesonDerivation = f: stdenv.mkDerivation
-    (lib.extends
-      (lib.composeExtensions bsdNoLinkAsNeeded localSourceLayer)
-      f);
+  mkMesonDerivation = f: let
+    exts = [
+      miscGoodPractice
+      bsdNoLinkAsNeeded
+      localSourceLayer
+    ];
+  in stdenv.mkDerivation
+   (lib.extends
+     (lib.foldr lib.composeExtensions (_: _: {}) exts)
+     f);
 }