- update to 2.15:
  * Mikael Simberg and Tom "spot" Callaway have pointed out the
    missing symbols issue when linking PPC or i386
    builds.
  * Roman Geissler has contributed a fix to nasty initialization
    bug introduced in 2.13 (see github issue #1452 for one example
    where it fails).
  * spinlock delay support now has proper windows support.
    Instead of simply sleeping, it uses WaitOnAddress (which is
    basically windows equivalent of futexes). This improvement was
    contributed by Lennox Ho.
  * we now have basic QNX support (basic malloc + heap profiler)
    championed by Xiang.Lin. Thanks! Do note, however, that QNX
    doesn't provide SIGPROF ticks, so there will be no cpu profiler
    support on this OS.
  * several people have contributed various improvements to our
    cmake build: Lennox Ho, Sergey Fedorov, Mateusz Jakub Fila. But
    do note that cmake build is still incomplete and best-effort.
  * Julian Schroeder have fixed generic_fp incompatibility with
    ARM pointer auth.
  * Mateusz Jakub Fila has contributed implementation of
    mallocinfo2 function (64-bit version of mallinfo).
  * Lennox Ho has contributed the ability to disable malloc
    functions patching on windows when TCMALLOC_DISABLE_REPLACEMENT=1
    environment variable is set.
  * User poljak181 has contributed a fix to infinite recursion in
    some cases of malloc hooks (or user-replaced operator new) and
    MallocExtension::instance().
  * Sergey Fedorov has contributed a fix to use MAP_ANON on some
    older OSes without MAP_ANONYMOUS.

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