- update to 2.7.1:
  * Workaround crashes when virtual machines report incoherent x86 CPUID
    information about numbers of cores and threads.
    Thanks to Peter Bense for the report.
  * Use setenv() instead of putenv() when trying to force enable oneAPI L0
    support, to avoid issues with applications that touch the environment,
    thanks to Josh Hursey for the patch.
  * Add some warnings at the end of configure when GPU libraries are
    missing on the system or their path is missing in the environment.
  * Backends
    + Add support for NUMA nodes and caches with more than 64 PUs across
      multiple processor groups on Windows 11 and Windows Server 2022.
    + Group objects are not created for Windows processor groups anymore,
      except if HWLOC_WINDOWS_PROCESSOR_GROUP_OBJS=1 in the environment.
    + Expose "Cluster" group objects on Linux kernel 5.16+ for CPUs
      that share some internal cache or bus. This can be equivalent
      to the L2 Cache level on some platforms (e.g. x86) or a specific
      level between L2 and L3 on others (e.g. ARM Kungpeng 920).
      Thanks to Jonathan Cameron for the help.
      - HWLOC_DONT_MERGE_CLUSTER_GROUPS=1 may be set in the environment
	to prevent these groups from being merged with identical caches, etc.
    + Improve the oneAPI LevelZero backend:
      - Expose subdevices such as "ze0.1" inside root OS devices ("ze0")
	when the hardware contains multiple subdevices.
      - Add many new attributes to describe device type, and the
	numbers of slices, subslices, execution units and threads.
      - Expose the memory information as LevelZeroHBM/DDR/MemorySize infos.
    + Ignore the max frequencies of cores in Linux cpukinds when the
      base frequencies are available (to avoid exposing hybrid CPUs
      when Intel Turbo Boost Max 3.0 gives slightly different max

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