Add sdl2glue to vendor:wgpu package + triangle example

vendor/wgpu/examples/glfw/build.bat

@@ -0,0 +1,12 @@
+REM NOTE: changing this requires changing the same values in the `web/index.html`.
+set INITIAL_MEMORY_PAGES=2000
+set MAX_MEMORY_PAGES=65536
+
+set PAGE_SIZE=65536
+set /a INITIAL_MEMORY_BYTES=%INITIAL_MEMORY_PAGES% * %PAGE_SIZE%
+set /a MAX_MEMORY_BYTES=%MAX_MEMORY_PAGES% * %PAGE_SIZE%
+
+call odin.exe build . -target:js_wasm32 -out:web/triangle.wasm -o:size -extra-linker-flags:"--export-table --import-memory --initial-memory=%INITIAL_MEMORY_BYTES% --max-memory=%MAX_MEMORY_BYTES%"
+
+copy "..\..\wgpu.js" "web\wgpu.js"
+copy "..\..\..\wasm\js\runtime.js" "web\runtime.js"