comp-builder: exclude hsc2hs from build-tools as it is never used,

 since it is provided by ghc env, which is first in PATH.
 This avoid possible collisions when using eg. devshells, which
 fuse all binaries into a single output directory.

Author: jbgi

builder/comp-builder.nix

@@ -239,9 +239,12 @@ let
   executableToolDepends =
     (lib.concatMap (c: if c.isHaskell or false
       then builtins.attrValues (c.components.exes or {})
-      else [c]) 
-      (builtins.filter (x: !(isNull x))
-      (map 
+      else [c])
+      (builtins.filter (x: !(isNull x)
+        # We always exclude hsc2hs from build-tools because it is unecessary as it is provided by ghc
+        # and hsc2hs from ghc is first in PATH so the one from build-tools is never used.
+        && x.identifier.name or "" != "hsc2hs")
+      (map
         (p: if builtins.isFunction p
           then p { inherit  (package.identifier) version; inherit revision; }
           else p) build-tools))) ++
@@ -328,7 +331,7 @@ let
     outputHashMode = "recursive";
     outputHashAlgo = "sha256";
   };
-                    
+
   drv = stdenv.mkDerivation (commonAttrs // contentAddressedAttrs // {
     pname = nameOnly;
     inherit (package.identifier) version;