README.md: Add macOS glew requirement

I found the need to use homebrew to install glew (I already had sdl2 installed) before I was able to compile the code successfully.
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Andy Piper 2023-08-11 15:03:45 +01:00 committed by GitHub
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@ -34,7 +34,7 @@ make sokol
Currently only the SDL2 backend works. macOS is very picky about the GLSL shader version when compiling with Sokol and OpenGL3.3; it shouldn't be too difficult to get it working, but will probably require a bunch of `#ifdefs` for SDL and WASM. PRs welcome!
```
brew install sdl2
brew install sdl2 glew
make sdl
```