Set copyright holders displayed in notices separately from the package name

This helps avoid accidental removal of upstream copyright names

src/util.cpp

@@ -834,3 +834,10 @@ int GetNumCores()
 #endif
 }
 
+std::string CopyrightHolders()
+{
+    std::string strCopyrightHolders = _(COPYRIGHT_HOLDERS);
+    if (strCopyrightHolders.find("%s") == strCopyrightHolders.npos)
+        return strCopyrightHolders;
+    return strprintf(strCopyrightHolders, _(PACKAGE_NAME));
+}