databases/mongodb80: build error on FreeBSD 16

src/third_party/boost/boost/mpl/aux_/integral_wrapper.hpp:62:51: error: in-class initializer for static data member is not a constant expression

62 |     BOOST_STATIC_CONSTANT(AUX_WRAPPER_VALUE_TYPE, prior_value = BOOST_MPL_AUX_STATIC_CAST(AUX_WRAPPER_VALUE_TYPE, (N - 1)));
   |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Upstream has newer versions. So upgrading probably fixes this.
But upgrading needs adoption of Bazel as a build system.
Help is appreciated for moving to Bazel.