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"
+            					'';
         };
       }
     );