Remove platform suffix from binary produced by default flake target

flake.nix

@@ -57,7 +57,7 @@
         {}
         supportedSystems;
 
-      # eachCrossSystem [system] (buildSystem: targetSystem: ...)
+      # eachCrossSystem [system] ({buildSystem, targetSystem, isDefault }: ...)
       #
       # Returns an attrset with a key "$buildSystem.cross-$targetSystem" for
       # every combination of the elements of the array of system strings. The
@@ -72,13 +72,20 @@
           pkgs = mkPkgs buildSystem null;
           crosses = builtins.foldl'
             (inner: targetSystem: inner // {
-              "cross-${targetSystem}" = callback buildSystem targetSystem;
+              "cross-${targetSystem}" = callback {
+                inherit buildSystem targetSystem;
+                isDefault = false;
+              };
             })
-            { default = callback buildSystem buildSystem; }
+            {}
             supportedSystems;
         in
           crosses // (rec {
-            default = callback buildSystem buildSystem;
+            default = callback {
+              inherit buildSystem;
+              targetSystem = buildSystem;
+              isDefault = true;
+            };
             release = let
               bins = pkgs.symlinkJoin {
                 name = "${default.name}-all-bins";
@@ -164,7 +171,7 @@
 
       packages = eachCrossSystem
         (builtins.attrNames buildTargets)
-        (buildSystem: targetSystem: let
+        ({ buildSystem, targetSystem, isDefault }: let
           pkgs = mkPkgs buildSystem null;
           toolchain = mkToolchain buildSystem targetSystem;
           naersk-lib = pkgs.callPackage naersk {
@@ -177,7 +184,7 @@
             strictDeps = true;
             doCheck = false;
             release = true;
-            postInstall = ''
+            postInstall = if isDefault then "" else ''
               cd "$out"/bin
               for f in "$(ls)"; do
                 if ext="$(echo "$f" | grep -oP '\.[a-z]+$')"; then
@@ -193,7 +200,7 @@
 
       devShells = eachCrossSystem
         (builtins.attrNames buildTargets)
-        (buildSystem: targetSystem: let
+        ({ buildSystem, targetSystem, isDefault }: let
           pkgs = mkPkgs buildSystem null;
           toolchain = mkToolchain buildSystem targetSystem;
         in