Copy the Clang builtin headers as part of the build if they are available.

src/CppParser/premake4.lua

@@ -15,6 +15,12 @@ project "CppSharp.CppParser"
   flags { common_flags }
   flags { "NoRTTI" }
 
+  local copy = os.is_windows() and "xcopy /Q /E /Y /I" or "cp -rf";
+  local headers = path.getabsolute(path.join(LLVMRootDir, "lib/"))
+  if os.isdir(headers) then
+    postbuildcommands { copy .. " " .. headers .. " %{cfg.targetdir}" }
+  end
+
   configuration "vs*"
     buildoptions { clang_msvc_flags }