[RELEASE] LTTng-UST 2.13.1 (Linux user-space tracer)

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This 2.13.1 release of LTTng-UST is a bugfix-only release for various
shortcomings that were identified in the 2.13.0 release.

A few key highlights: the C++ support for building probe providers has
been improved, async-signal-safety of the close wrapper has been fixed,
pthread cancelstate in nested use scenarios is now properly handled.

2021-12-10 (Lost and Found Day) lttng-ust 2.13.1
        * Fix: ust-compiler: constructor/destructor build on g++ 4.8
        * ust-compiler: constructor/destructor whitespaces layout and macro dependency
        * Fix: ust-cancelstate: include string.h for strerror
        * Fix: libnuma is prepended to LIBS
        * fix: Allow disabling some abi compat tests
        * Fix: generate probe registration constructor as a C++ constuctor
        * Fix: nestable pthread cancelstate
        * Fix: abort on decrement_sem_count during concurrent tracing start and teardown
        * fix: allocating C++ compound literal on heap with Clang
        * Check for C++11 when building C++ probe providers
        * fix: liblttng-ust-fd async-signal-safe close()
        * tracepoints: print debug message when lttng-ust-tracepoint.so is not found
        * Fix: static_assert unavailable with glibc < 2.16
        * Fix: combined tracing of lttng-ust 2.12/2.13 generates corrupted traces
        * doc/man: Document LTTNG_UST_ABORT_ON_CRITICAL variable
        * fix: remove autoconf features default value in help message
        * Set git-review branch to stable-2.13
        * Fix: add extern "C" to two header files

Project website: https://lttng.org
Documentation: https://lttng.org/docs
Download link: https://lttng.org/download

Mathieu Desnoyers
EfficiOS Inc.

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