ld-is-cc-hook: init

This hook sets LD to CC, for use with software that works as if LD=$CC when LD
is unset, and does not work when LD=ld.

pkgs/build-support/setup-hooks/ld-is-cc-hook.sh

@@ -0,0 +1,5 @@
+ld-is-cc-hook() {
+    LD=$CC
+}
+
+preConfigureHooks+=(ld-is-cc-hook)

pkgs/top-level/all-packages.nix

@@ -287,6 +287,9 @@ with pkgs;
     inherit url;
   };
 
+  ld-is-cc-hook = makeSetupHook { name = "ld-is-cc-hook"; }
+    ../build-support/setup-hooks/ld-is-cc-hook.sh;
+
   libredirect = callPackage ../build-support/libredirect { };
 
   madonctl = callPackage ../applications/misc/madonctl { };