vim: enable fortify when using clang (#506853)

pkgs/applications/editors/vim/common.nix

@@ -1,4 +1,8 @@
-{ lib, fetchFromGitHub }:
+{
+  lib,
+  fetchFromGitHub,
+  stdenv,
+}:
 rec {
   version = "9.2.0106";
 
@@ -17,7 +21,7 @@ rec {
   enableParallelBuilding = true;
   enableParallelInstalling = false;
 
-  hardeningDisable = [ "fortify" ];
+  hardeningDisable = if stdenv.cc.isClang then [ "strictflexarrays1" ] else [ "fortify" ];
 
   # Use man from $PATH; escape sequences are still problematic.
   postPatch = ''

pkgs/applications/editors/vim/default.nix

@@ -17,7 +17,7 @@
 }:
 
 let
-  common = callPackage ./common.nix { };
+  common = callPackage ./common.nix { inherit stdenv; };
 in
 stdenv.mkDerivation {
   pname = "vim";

pkgs/applications/editors/vim/full.nix

@@ -81,7 +81,7 @@ let
     endif
   '';
 
-  common = callPackage ./common.nix { };
+  common = callPackage ./common.nix { inherit stdenv; };
 
 in
 stdenv.mkDerivation {