Rebase to 1.81.0
    
      See https://fedoraproject.org/wiki/Changes/F38Boost181
    Drop patches:
      deleted: boost-1.58.0-pool.patch
      deleted: boost-1.58.0-pool-test_linking.patch
      deleted: boost-1.78.0-build-optflags.patch
      deleted: boost-1.73-locale-empty-vector.patch
      deleted: boost-1.76.0-fix_multiprecision_issue_419-ppc64le.patch
      deleted: boost-1.76.0-ptr_cont-xml.patch
      deleted: boost-1.78.0-fix-b2-staging.patch
      deleted: boost-1.76.0-enum_type_object-type-python-3.11.patch
    - New Boost.URL runtime component
    - boost_build directory is now b2 in upstream, renamte to boost_build on install