Avoid exporting global variables (functions only)

[andrei@…]

Win32 (sorry, again) doesn't like exported global variables and segfaults when accessing gContext and g_SSDP. The attached patch is very raw, I'm not suggesting to commit it as is, I'm just asking for opinion. If this will be considered a good idea, I'll hunt down other globals as well and submit another patch.

For better effect, CreateMythContext (introduced in this patch) can be combined with mandatory gContext->Init.

[David Bussenschutt <davidbuzz@…>]

+1 opinion, if it helps at all.

[danielk]

Nigel has been looking at these types of issues, so I'm assigning this to him. But there must be a way to allow globals in these DLL's. I personally don't think a global function is any better than a global variable, coding style wise.

[Nigel]

After Isaac eliminated the circular library dependencies, this segfaulting stopped, so it was probably a side-effect of the library symbol .def files (which I guess should be removed). Anyway, this can be closed.