Fix Windows slipstream: install pkgconfiglite, set OPENSSL_ROOT_DIR

Author: SamNet-dev

.github/workflows/release.yml

@@ -95,21 +95,25 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
 
-      - name: Install cmake
-        run: choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System' -y
+      - name: Install deps
+        run: |
+          choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System' -y
+          choco install pkgconfiglite -y
 
       - name: Pre-build picoquic with bash
         shell: bash
         working-directory: slipstream-rust
         env:
           PICOQUIC_BUILD_DIR: ${{ github.workspace }}/slipstream-rust/.picoquic-build
+          OPENSSL_ROOT_DIR: C:/Program Files/OpenSSL
         run: bash scripts/build_picoquic.sh
 
       - name: Build slipstream-client
         shell: bash
         working-directory: slipstream-rust
         env:
           PICOQUIC_BUILD_DIR: ${{ github.workspace }}/slipstream-rust/.picoquic-build
+          OPENSSL_ROOT_DIR: C:/Program Files/OpenSSL
         run: |
           cargo build --release -p slipstream-client --features slipstream-ffi/openssl-vendored
           cp target/release/slipstream-client.exe ../slipstream-client-windows-amd64.exe