MINOR: Pass vcpkg toolchain to Arrow C++ CMake configure step

The xsimd installation via vcpkg was not visible to CMake because the
vcpkg toolchain file was not passed to the Arrow C++ configure step.

Author: jbonofre

ci/scripts/jni_manylinux_build.sh

@@ -77,7 +77,9 @@ cmake \
   -S "${arrow_dir}/cpp" \
   -B "${build_dir}/cpp" \
   --preset=ninja-release-jni-linux \
-  -DCMAKE_INSTALL_PREFIX="${install_dir}"
+  -DCMAKE_INSTALL_PREFIX="${install_dir}" \
+  -DCMAKE_TOOLCHAIN_FILE="${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake" \
+  -DVCPKG_TARGET_TRIPLET="${VCPKG_TARGET_TRIPLET}"
 cmake --build "${build_dir}/cpp"
 cmake --install "${build_dir}/cpp"
 github_actions_group_end