liburcu: Update to version 0.15.0

liburcu: Update to version 0.15.0

- Update from version 0.14.1 to 0.15.0
- Update of rootfile
- Changelog
    0.15.0
	* Fix compilation errors
	* Document cmm_cast_volatile
	* Honor URCU_DEREFERENCE_USE_VOLATILE
	* arm: Use atomic builtins for xchg if supported
	* Introduce _CMM_TOOLCHAIN_SUPPORT_C11_MM
	* Seperate uatomic and uatomic_mo
	* uatomic: Fix header guard comment
	* Fix: missing typename in URCU_FORCE_CAST
	* Allow building with GCC >= 13.3 on RISC-V
	* pointer.h: Fix the rcu_cmpxchg_pointer documentation
	* rculfhash: make cds_lfht_iter_get_node argument const
	* lfstack: make cds_lfs_empty argument const
	* wfcqueue: make cds_wfcq_empty arguments const
	* wfstack: make cds_wfs_empty argument const
	* cds_list: make cds_list_replace @old argument const
	* cds_list: make cds_list_empty const
	* Adjust shell script to allow Bash in other locations
	* futex.h: Indent preprocessor directives
	* futex.h: Use urcu_posix_assert to validate unused values
	* Use futex on OpenBSD
	* fix: handle EINTR correctly in get_cpu_mask_from_sysfs
	* Relicense src/compat-smp.h to MIT
	* uatomic/x86: Remove redundant memory barriers
	* cleanup: move rand_r compat code to tests
	* ppc: Document cache line size choice
	* Fix: change order of _cds_lfht_new_with_alloc parameters
	* Add support for custom memory allocators for rculfhash
	* ppc.h: use mftb on ppc
	* rcutorture: Check histogram of ages
	* docs: Add links to project resources
	* Fix: allow clang to build liburcu on RISC-V
	* Fix -Walloc-size
	* cleanup: use an enum for the error states of nr_cpus_mask
	* fix: add missing SPDX licensing tags
	* urcu/uatomic/riscv: Mark RISC-V as broken
	* Fix: urcu-bp: misaligned reader accesses
	* rculfhash: Only pass integral types to atomic builtins
	* LoongArch: Document that byte and short atomics are implemented with LL/SC
	* Add LoongArch support
	* Tests: Add test for byte/short atomics on addresses which are not word-aligned
	* Complete removal of urcu-signal flavor
	* doc/examples: Remove urcu-signal example
	* tests/common: Remove urcu-signal common test files
	* tests/benchmark: Remove urcu-signal benchmark tests
	* tests/regression: Remove urcu-signal regression tests
	* tests/unit: Remove urcu-signal unit tests
	* Fix: Add missing cmm_smp_mb() in deprecated urcu-signal
	* urcu/uatomic.h: Improve verbosity of static assert error messages
	* urcu/compiler: Add urcu_static_assert
	* Phase 1 of deprecating liburcu-signal
	* uatomic/generic: Fix redundant declaration warning
	* tests: Add tests for checking race conditions
	* Add cmm_emit_legacy_smp_mb()
	* urcu/annotate: Add CMM annotation
	* tests/unit/test_build: Quiet unused return value
	* benchmark: Use uatomic for accessing global states
	* tests: Use uatomic for accessing global states
	* urcu-wait: Fix wait state load/store
	* Add CMM memory model
	* urcu/arch/generic: Use atomic builtins if configured
	* urcu/compiler: Use atomic builtins if configured
	* configure: Add --enable-compiler-atomic-builtins option
	* Fix: tests/rcutorture: Put thread offline on busy-wait
	* tests/regression/rcutorture: Use urcu-wait
	* tests/rcutorture: Factor out thread registration
	* tests/regression/rcutorture: Add wait state
	* urcu-wait: Initialize node in URCU_WAIT_NODE_INIT
	* Complete REUSE support
	* extras/abi: license data files under CC-1.0
	* examples: use SPDX identifiers
	* tests: use SPDX identifiers
	* src: use SPDX identifiers
	* Public headers: use SPDX identifiers
	* Build system: use SPDX identifiers
	* Fix: urcu-wait: add missing futex.h include
	* doc: update GCC baseline to 4.8
	* doc: update FreeBSD tested version
	* doc: Remove Solaris from tested platforms
	* Revert "compiler.h: Introduce caa_unqual_scalar_typeof"
	* rculfhash: Use caa_container_of_check_null in cds_lfht_entry
	* compiler.h: Introduce caa_container_of_check_null
	* compiler.h: Introduce caa_unqual_scalar_typeof
	* Avoid calling caa_container_of on NULL pointer in cds_lfht macros
	* Fix: revise urcu_read_lock_update() comment
	* Fix: uatomic powerpc comment about lwsync
	* fix: aarch64: allow RHEL7 gcc 4.8.5-11
	* aarch64: Implement caa_cpu_relax as yield instruction
	* fix: warning 'noreturn' function does return on ppc
	* Fix: use __noreturn__ for C11-compatibility
	* Adjust shell scripts to allow Bash in other locations
	* Add support for OpenBSD
	* Bump version to 0.15.0-pre

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>