add RRawFileCurl plugin

Author: jblomer

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

@@ -0,0 +1,15 @@
+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)");
+   }
+}