fix(cpp1): workaround Clang 12's -Wgnu-zero-variadic-macro-arguments

Author: JohelEGP

source/cppfront.cpp

@@ -2972,9 +2972,9 @@ class cppfront
                     for (auto&& e: args.value().text_chunks) {
                         suffix.push_back(e);
                     }
-                    suffix.emplace_back("),(,), ", i->op->position());
+                    suffix.emplace_back("),(), ", i->op->position());
                 } else {
-                  suffix.emplace_back("),()", i->op->position());
+                    suffix.emplace_back("),()", i->op->position());
                 }
                 args.reset();
             }