Remove the CMake patching workaround

Signed-off-by: Slendi <slendi@socopon.com>

flake.nix

@@ -26,10 +26,6 @@
           hardeningDisable = [ "fortify" ];
 
           packages = with pkgs; [
-            (pkgs.callPackage ./nix/cmake-importstd-patched/package.nix {
-              libcxx = pkgs.llvmPackages_20.libcxx;
-            })
-
             pkg-config
             cmake
             ninja
@@ -63,6 +59,10 @@
             xorg.libXau
             xorg.libXdmcp
           ];
+
+          shellHook = ''
+            						export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -B${pkgs.llvmPackages_20.libcxx}/lib -I${pkgs.llvmPackages_20.libcxx.dev}/include/c++/v1"
+            					'';
         };
       }
     );

nix/cmake-importstd-patched/package.nix

@@ -1,37 +0,0 @@
-# Dummy cmake package for replacing the ImportStd module.
-# Symlink existing derivation to avoid rebuilding package from source.
-# I.e. rather than using overlay or override(Attr) to add patch.
-#
-# Note this is actually a clang/llvm issue (`-print-file-name` flag not working),
-# but it is much simpler to just patch the cmake module itself. Maybe fixed in llvm 19.1.7
-#
-# See relevant issues:
-# 1. https://github.com/NixOS/nixpkgs/issues/370217
-# 2. https://gitlab.kitware.com/cmake/cmake/-/issues/25965#note_1523575
-{
-  lib,
-  cmake,
-  libcxx,
-  symlinkJoin,
-}:
-let
-  cmake-ver = "${lib.versions.majorMinor cmake.version}";
-  module-path = "share/cmake-${cmake-ver}/Modules/Compiler/Clang-CXX-CXXImportStd.cmake";
-in
-symlinkJoin {
-  name = "${cmake.name}-importstd-module-patched";
-  paths = [ cmake ];
-  postBuild = ''
-    # copy binaries to avoid using original derivation
-    for link in $(find $out/bin/ -type l); do
-      cp --remove-destination $(readlink $link) $out/bin/
-    done;
-
-    # replace symlink to existing module with copy for editing
-    cp --remove-destination $(readlink $out/${module-path}) $out/${module-path}
-
-    # replace "libc++.modules.json" with full path
-    # to libc++ module json in new copied module file
-    sed -i 's#libc++.modules.json#${libcxx}/lib/libc++.modules.json#' $out/${module-path}
-  '';
-}