Wez Furlong e6a858664f windows: Software frontend is now mesa llvmpipe ...

This is a bit of a switch-up, see this comment for more background:
refs: https://github.com/wez/wezterm/issues/265#issuecomment-701882933

This commit:

* Adds a pre-compiled mesa3d opengl32.dll replacement
* The mesa dll is deployed to `<appdir>/mesa/opengl32.dll` which by
  default is ignored.
* When the frontend is set to `Software` then the `mesa` directory
  is added to the dll search path, causing the llvmpipe renderer
  to be enabled.
* The old software renderer implementation is available using the
  `OldSoftware` frontend name

I'm not a huge fan of the subdirectory for the opengl32.dll, but
I couldn't get it to work under a different dll name; the code
thought that everything was initialized, but the window just rendered
a white rectangle.

2020-10-01 18:31:57 -07:00

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