[CI] Enable ANGLE static linking.

Author: bruvzg

.github/workflows/windows_builds.yml

@@ -7,7 +7,7 @@ on:
 env:
   # Used for the cache key. Add version suffix to force clean build.
   GODOT_BASE_BRANCH: master
-  SCONSFLAGS: verbose=yes warnings=extra werror=yes module_text_server_fb_enabled=yes d3d12=yes
+  SCONSFLAGS: verbose=yes warnings=extra werror=yes module_text_server_fb_enabled=yes d3d12=yes "angle_libs=${{github.workspace}}/"
   SCONS_CACHE_MSVC_CONFIG: true
 
 concurrency:
@@ -54,6 +54,17 @@ jobs:
       - name: Download Direct3D 12 SDK components
         run: python ./misc/scripts/install_d3d12_sdk_windows.py
 
+      - name: Download pre-built ANGLE static libraries
+        uses: dsaltares/[email protected]
+        with:
+          repo: godotengine/godot-angle-static
+          version: tags/chromium/6029
+          file: Windows.6029-1.MSVC_17.x86_64.x86_32.zip
+          target: angle/angle.zip
+
+      - name: Extract pre-built ANGLE static libraries
+        run: Expand-Archive -Force angle/angle.zip ${{github.workspace}}/
+
       - name: Setup MSVC problem matcher
         uses: ammaraskar/msvc-problem-matcher@master