Mantis#1643. Thank you Melanie for a patch that:

In the new runtime, there is a flag to diable all os* comamnds. 
The implementation of osGetScriptEngineName ignored it. 
This patch fixes this.

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs

@@ -552,6 +552,12 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
         public string osGetScriptEngineName()
         {
+            if (!m_ScriptEngine.Config.GetBoolean("AllowOSFunctions", false))
+            {
+                OSSLError("osGetScriptEngineName: permission denied");
+                return "";
+            }
+
             m_host.AddScriptLPS(1);
 
             int scriptEngineNameIndex = 0;