add RRawFileCurl plugin

Author: jblomer

etc/plugins/ROOT@@Internal@@RRawFile/P015_RRawFileCurl.C

@@ -0,0 +1,11 @@
+void P015_RRawFileCurl()
+{
+   TString configfeatures = gROOT->GetConfigFeatures();
+
+   if (configfeatures.Contains("curl") &&
+       (!configfeatures.Contains("davix") || gEnv->GetValue("Curl.ReplaceDavix", 0))) {
+
+      gPluginMgr->AddHandler("ROOT::Internal::RRawFile", "^http[s]?:", "ROOT::Internal::RRawFileCurl", "RCurlHttp",
+                             "RRawFileCurl(std::string_view, ROOT::Internal::RRawFile::ROptions)");
+   }
+}