Remove install dependencies step for Windows

vcpkg will use the vcpkg.json files in the project dirs to do this automatically.

Author: kblaschke

.github/workflows/build.yaml

@@ -65,9 +65,6 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - name: Install Build Dependencies
-        run: vcpkg --triplet=x64-windows-static install glew gtest sdl2 poco
-
       - name: Checkout libprojectM Sources
         uses: actions/checkout@v3
         with: