httpapi: add stub for HttpCreateServerSession

[Louis Lenders]

Supermemo (https://www.supermemo.com/en/apps) just exits from start, after
writing in it`s errorlog:

2/13/2017 6:45:13 PM, v1.1.0.0] System.EntryPointNotFoundException: Unable
to find an entry point named 'HttpCreateServerSession' in DLL 'httpapi.dll'.
   at
System.Net.UnsafeNclNativeMethods.HttpApi.HttpCreateServerSession(HTTPAPI_VERSION
version, UInt64* serverSessionId, UInt32 reserved)
   at System.Net.HttpListener.SetupV2Config()

This stub makes it go further (though it doesnt start yet :(, yet another
bug )
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