Try to fix OpenSSL linking under Windows CI

Author: mqudsi

.github/workflows/rust.yml

@@ -18,9 +18,12 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set OPENSSL_DIR for Windows
+    - name: Install OpenSSL
       if: startsWith(matrix.os, 'windows')
-      run: echo "OPENSSL_DIR=C:\Program Files\OpenSSL" >> $env:GITHUB_ENV
+      run: vcpkg install openssl:x64-windows-static-md
+    - name: Configure OpenSSL to link via vcpkg
+      if: startsWith(matrix.os, 'windows')
+      run: echo "VCPKGRS_DYNAMIC=1" >> $env:GITHUB_ENV
     - name: Build
       run: cargo build --verbose
     - name: Run tests