Drop cling guard when building lookup

Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com>

Author: aaronj0

lib/CppInterOp/CppInterOpInterpreter.h

@@ -97,10 +97,8 @@ inline clang::NamespaceDecl* Namespace(clang::Sema* S, const char* Name,
 
 inline void Named(clang::Sema* S, clang::LookupResult& R,
                   const clang::DeclContext* Within = nullptr) {
-#ifdef CPPINTEROP_USE_CLING
   if (Within)
     Within->getPrimaryContext()->buildLookup();
-#endif
   R.suppressDiagnostics();
   if (!Within)
     S->LookupName(R, S->TUScope);