[libvpx] Windows: Use NASM instead of Yasm

.github/workflows/windows.yml

@@ -14,20 +14,6 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Download yasm.exe
-      run: |
-        curl -o libs\win32\libvpx\yasm.exe https://files.freeswitch.org/downloads/win64/yasm-1.3.0.87.g121a.exe
-
-    - name: Verify and Run yasm.exe
-      run: |
-        if exist libs\win32\libvpx\yasm.exe (
-          libs\win32\libvpx\yasm.exe --version
-        ) else (
-          echo ERROR: yasm.exe not found!
-          exit 1
-        )
-      shell: cmd
-
     - name: Add msbuild to PATH
       uses: microsoft/setup-msbuild@v2