pkgsi686Linux.vulkan-loader: drop upstreamed 32-bit patch

Without the change the build fails on `staging` as:

       > applying patch /nix/store/d4cmw6xgqzlqraj0xk9f4c5xsryc7amg-ecd88b5c6b1e4c072c55c8652d76513d74c5ad4e.patch
       > patching file CMakeLists.txt
       > Hunk NixOS#1 FAILED at 190.

pkgs/by-name/vu/vulkan-loader/package.nix

@@ -2,7 +2,6 @@
   lib,
   stdenv,
   fetchFromGitHub,
-  fetchpatch,
   cmake,
   pkg-config,
   libX11,
@@ -28,15 +27,7 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   patches =
-    [ ./fix-pkgconfig.patch ]
-    ++ lib.optionals stdenv.hostPlatform.is32bit [
-      # Backport patch to support 64-bit inodes on 32-bit systems
-      # FIXME: remove in next update
-      (fetchpatch {
-        url = "https://github.com/KhronosGroup/Vulkan-Loader/commit/ecd88b5c6b1e4c072c55c8652d76513d74c5ad4e.patch";
-        hash = "sha256-Ea+v+RfmVl8fRbkr2ETM3/7R4vp+jw7hvTq2hnw4V/0=";
-      })
-    ];
+    [ ./fix-pkgconfig.patch ];
 
   nativeBuildInputs = [
     cmake