DynamicLibraryManager::loadLibrary if the parameter resolve is false

The error occurs only when `loadLibrary()` is called with the argument `resolved = false`.
A const string reference is not possible here because a temporary copy of
lResolved would be referenced. The return type of libStem.str() has the
value type prvalue. Therefore, lResolved requires the same type and the
compiler inserts a copy constructor to satisfy this. For more details
see rule 3.3.1 here:
https://en.cppreference.com/w/cpp/language/operator_other#Conditional_operator

interpreter/cling/lib/Interpreter/DynamicLibraryManager.cpp

@@ -355,11 +355,12 @@ namespace cling {
         (resolved ? "resolved" : "not-resolved") << "\n";
     }
 
-    std::string lResolved;
-    const std::string& canonicalLoadedLib = resolved ? libStem.str() : lResolved;
-    if (!resolved) {
-      lResolved = lookupLibrary(libStem);
-      if (lResolved.empty())
+    std::string canonicalLoadedLib;
+    if (resolved) {
+      canonicalLoadedLib = libStem.str();
+    } else {
+      canonicalLoadedLib = lookupLibrary(libStem);
+      if (canonicalLoadedLib.empty())
         return kLoadLibNotFound;
     }