add TCurlFile plugin

Author: jblomer

etc/plugins/TFile/P140_TCurlFile.C

@@ -0,0 +1,15 @@
+void P140_TCurlFile()
+{
+   TString configfeatures = gROOT->GetConfigFeatures();
+
+   if (configfeatures.Contains("curl") &&
+       (!configfeatures.Contains("davix") || gEnv->GetValue("Curl.ReplaceDavix", 0))) {
+
+      gPluginMgr->AddHandler(
+         "TFile",
+         "^http[s]?:",
+         "TCurlFile",
+         "RCurlHttp",
+         "TCurlFile(const char *, Option_t *)");
+   }
+}