Attempt to fix Windows OpenSSL compilation failures.

.github/workflows/ci.yml

@@ -0,0 +1,78 @@
+name: ci
+on: [push, pull_request]
+env:
+  RUSTFLAGS: "-D warnings"
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        rust: [1.78.0, stable, beta, nightly]
+    env:
+      VCPKG_ROOT: "${{ github.workspace }}\\vcpkg"
+      VCPKGRS_TRIPLET: x64-windows-release
+      # Ensure that OpenSSL is dynamically linked.
+      VCPKGRS_DYNAMIC: 1    
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v1
+    - name: Install Rust
+      uses: hecrj/setup-rust-action@v2
+      with:
+        rust-version: ${{ matrix.rust }}
+    - if: matrix.os == 'ubuntu-latest'
+      run: sudo apt-get install -y libssl-dev
+    - if: matrix.os == 'windows-latest'
+      id: vcpkg
+      uses: johnwason/vcpkg-action@v6
+      with:
+        pkgs: openssl
+        triplet: ${{ env.VCPKGRS_TRIPLET }}
+        token: ${{ github.token }}
+        github-binarycache: true
+    - if: matrix.rust == 'stable'
+      run: rustup component add clippy
+    - if: matrix.rust == 'stable'
+      run: cargo clippy --all-features --all-targets -- -D warnings
+    - if: matrix.rust == 'stable' && matrix.os == 'ubuntu-latest'
+      run: cargo fmt --all -- --check
+    - run: cargo check --no-default-features --all-targets
+    - run: cargo test --all-features
+
+  minimal-versions:
+    name: Check minimal versions
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v1
+    - name: Install Rust
+      uses: hecrj/setup-rust-action@v2
+      with:
+        rust-version: "1.78.0"
+    - name: Install nightly Rust
+      run: rustup install nightly
+    - name: Check with minimal-versions
+      run: |
+        cargo +nightly update -Z minimal-versions
+        cargo check --all-features --all-targets --locked
+
+  extra-tests:
+    name: Extra tests
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v1
+    - name: Install Rust
+      uses: hecrj/setup-rust-action@v2
+    - name: Install supporting tools/libraries
+      run: |
+        # The tests compare their output to that of LDNS tools, so we need to
+        # install them. Some tests work with DNSSEC keys for which the OpenSSL
+        # library must be compiled against which requires C build programs and
+        # pkg-config. Install everything we need.
+        sudo apt-get update
+        sudo apt-get install -y build-essential ldnsutils libssl-dev pkg-config
+    - name: Run tests that are normally ignored
+      run: cargo test --all-features --all-targets -- --ignored