pyoxigraph: optional vendored OpenSSL

Vendored OpenSSL is only useful only for manylinux builds. We should keep using the system OpenSSL builds in the other cases.

.github/workflows/build.yml

@@ -94,7 +94,7 @@ jobs:
         with:
           manylinux: auto
           command: build
-          args: -m python/Cargo.toml
+          args: -m python/Cargo.toml --cargo-extra-args="--features vendored"
 
   python_wheel_mac:
     runs-on: macos-latest
@@ -115,6 +115,8 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
+      - run: Remove-Item -LiteralPath "C:\msys64\" -Force -Recurse
+      - run: choco install llvm -y
       - uses: messense/maturin-action@v1
         with:
           command: build

.github/workflows/release.yml

@@ -101,7 +101,7 @@ jobs:
         with:
           manylinux: auto
           command: publish
-          args: -m python/Cargo.toml -u __token__ -p ${{ secrets.PYPI_PASSWORD }}
+          args: -m python/Cargo.toml --cargo-extra-args="--features vendored" -u __token__ -p ${{ secrets.PYPI_PASSWORD }}
   publish_pypi_mac:
     runs-on: macos-latest
     needs: publish_lib_crate
@@ -120,6 +120,8 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: true
+      - run: Remove-Item -LiteralPath "C:\msys64\" -Force -Recurse
+      - run: choco install llvm -y
       - uses: messense/maturin-action@v1
         with:
           command: publish

python/Cargo.toml

@@ -18,4 +18,7 @@ doctest = false
 [dependencies]
 oxigraph = {version = "0.3.0-dev", path="../lib", features = ["http_client"]}
 pyo3 = {version = "0.15", features = ["extension-module", "abi3-py36"]}
-native-tls = {version = "0.2", features = ["vendored"]}
+native-tls = "0.2"
+
+[features]
+vendored = ["native-tls/vendored"]