scs: implement EventHandlerThread for shell

libraries/libstratosphere/source/htc/tenv/htc_tenv.cpp

@@ -15,6 +15,7 @@
  */
 #include <stratosphere.hpp>
 #include "impl/htc_tenv_allocator.hpp"
+#include "impl/htc_tenv_impl.hpp"
 
 namespace ams::htc::tenv {
 
@@ -23,4 +24,8 @@ namespace ams::htc::tenv {
         impl::InitializeAllocator(allocate, deallocate);
     }
 
+    void UnregisterDefinitionFilePath(os::ProcessId process_id) {
+        return impl::UnregisterDefinitionFilePath(process_id.value);
+    }
+
 }