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A few misc fixes

Jesse Natalie requested to merge jenatali/mesa:dzn-prototype into dzn-wsi-entrypoints-debug

After the HACK patch to get things building, the next 2 patches fix up WARP support a bit, and then the last patch is the proper fix for the weak symbol shenanigans on Windows. I'll go ahead and send that upstream.

Before, if the table previously had NULL, we'd unconditionally fill it in, either with a real function, or a pointer to NULL. Now, we only actually fill in a non-null pointer if it's a real function. This also means that apps can do null checks on functions that aren't implemented by either common code or the driver. Without this, we'll always return something.

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