Don't build static libssh2

As of libssh2 1.11.0, libssh2 also builds static libraries even if
`BUILD_SHARED_LIBS` is enabled.  We don't want that, so we tell CMake
not to do it.

.github/workflows/libssh2.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Fetch dependencies
         run: powershell winlib-builder/scripts/fetch-deps -lib libssh2 -version ${{github.event.inputs.php}} -vs ${{steps.virtuals.outputs.vs}} -arch ${{matrix.arch}} -stability ${{github.event.inputs.stability}}
       - name: Configure libssh2
-        run: cd libssh2 && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} -DCRYPTO_BACKEND=OpenSSL -DOPENSSL_ROOT_DIR:PATH=${{github.workspace}}/deps -DENABLE_ZLIB_COMPRESSION=ON -DZLIB_INCLUDE_DIR:PATH=${{github.workspace}}/deps/include -DZLIB_LIBRARY:FILEPATH=${{github.workspace}}/deps/lib/zlib_a.lib -DBUILD_SHARED_LIBS=ON .
+        run: cd libssh2 && cmake -G "Visual Studio 17 2022" -A ${{steps.virtuals.outputs.msarch}} -T ${{steps.virtuals.outputs.msts}} -DCMAKE_SYSTEM_VERSION=${{steps.virtuals.outputs.winsdk}} -DCRYPTO_BACKEND=OpenSSL -DOPENSSL_ROOT_DIR:PATH=${{github.workspace}}/deps -DENABLE_ZLIB_COMPRESSION=ON -DZLIB_INCLUDE_DIR:PATH=${{github.workspace}}/deps/include -DZLIB_LIBRARY:FILEPATH=${{github.workspace}}/deps/lib/zlib_a.lib -DBUILD_SHARED_LIBS=ON -DBUILD_STATIC_LIBS=OFF .
       - name: Build libssh2
         run: cd libssh2 && cmake --build . --config RelWithDebInfo
       - name: Install libssh2