- fix packaging of Boost.Contract on s390 and other platforms
  without Boost.Context support.
- fix build on older SLE SP by owning /usr/share/licenses directory

- Update to version 1.67.0
  New libraries:
  * Contract: Contract programming for C++. All contract
    programming features are supported: Subcontracting, class
    invariants, postconditions (with old and return values),
    preconditions, customizable actions on assertion failure (e.g.,
    terminate or throw), optional compilation and checking of
    assertions, etc, from Lorenzo Caminiti.
  * HOF: Higher-order functions for C++, from Paul Fultz II.
  Breaking changes in updated libraries:
  * atomic: Breaking change: Changed the result of the
    (op)_and_test operations added in Boost 1.66 to the opposite -
    the functions now return true if the operation result is
    non-zero. This is consistent with other test methods in
    Boost.Atomic and the C++ standard library. Users can define
    BOOST_ATOMIC_DETAIL_HIGHLIGHT_OP_AND_TEST when compiling their
    code to emit warnings on every use of the changed functions.
    This way users can locate the code that needs to be updated.
  * multiprecission: When converting a multiprecision integer to a
    narrower type, if the value is too large (or negative) to fit
    in the smaller type, then the result is either the maximum (or
    minimum) value of the target type. This was always the intended
    behaviour, but was somewhat haphazardly enforced before. If you
    really do want just the low order N bits of a value, then you
    will need to mask these out prior to the case, for example:
    static_cast<unsigned>(~static_cast<unsigned>(0) & my_value).
    Note that technically (to avoid undefined behaviour) you should
    do the same thing with built in integer types too.
  * spirit: Removed `with_context`
    utility: <boost/utility.hpp> header no longer includes
    boost::next and boost::prior as they have been moved to the
    iterator module. Instead include <boost/next_prior.hpp>. Other
    uses of <boost/utility.hpp> are discouraged, it's better to use
    the header for the specific functionality instead.
  * uuid: random_generator is no longer copyable
  Libraries that were updated: Asio, Atomic, Beast, ContainerHash,
  Context, Core, Coroutine2, DateTime, DLL, Fiber, Filesystem,
  Fusion, Locale, Log, Math, Multi-index Containers,
  Multiprecission, Optional, Phoenix, PolyCollection, Python,
  Spirit, Stacktrace, Test, TypeIndex, TypeTraits, Utility,
  Unordered, Units, Uuid, and Variant. For complete list of
  changes, see,
  https://www.boost.org/users/history/version_1_67_0.html
- refreshed patches:
  * boost-strict_aliasing.patch
  * boost-aarch64-flags.patch
- python_library_name.patch: adapted to not append version number
  to library names, like new boost is doing.
- disable python2 builds by default
- use regular Requires for libboost_header dependency

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