irony-server: don't use wrapped clang

Changed files
+1 -1
pkgs
development
tools
irony-server
+1 -1
pkgs/development/tools/irony-server/default.nix
···
name = "irony-server-${version}";
inherit (irony) version;
-
buildInputs = [ cmake llvmPackages.clang ];
+
nativeBuildInputs = [ cmake ];
dontUseCmakeBuildDir = true;