Merge bitcoin/bitcoin#36223: [29.x] More Backports

3aa499c794 doc: update release notes for v29.x (fanquake)
7265ca9bba build: avoid pipe2 on Darwin (for now) (fanquake)

Pull request description:

  Backports:
  * #36218

ACKs for top commit:
  hebasto:
    re-ACK 3aa499c794.

Tree-SHA512: fcc33637f223e4a561ef3a509934e46af19bccfb85ec55f8adb9caf4157869e0cc82640b0df085069ce6322e0b02d056aae3d68b3ab6eeddfc5e46e96d0c3eeb

cmake/introspection.cmake

@@ -15,7 +15,9 @@ check_include_file_cxx(vm/vm_param.h HAVE_VM_VM_PARAM_H)
 check_cxx_symbol_exists(O_CLOEXEC "fcntl.h" HAVE_O_CLOEXEC)
 check_cxx_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
 check_cxx_symbol_exists(fork "unistd.h" HAVE_DECL_FORK)
-check_cxx_symbol_exists(pipe2 "unistd.h" HAVE_DECL_PIPE2)
+if (NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  check_cxx_symbol_exists(pipe2 "unistd.h" HAVE_DECL_PIPE2)
+endif()
 check_cxx_symbol_exists(setsid "unistd.h" HAVE_DECL_SETSID)
 
 check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H)

doc/release-notes.md

@@ -42,11 +42,16 @@ Notable changes
 - #35691 chainparams: delete my DNS seed
 - #35766 p2p: Assume v2transport for addresses from seeds
 
+### Build
+
+- #36218 build: avoid pipe2 on Darwin (for now)
+
 Credits
 =======
 
 Thanks to everyone who directly contributed to this release:
 
+- fanquake
 - Martin Zumsande
 - sipa