[libcxx] [libunwind] [DRAFT][libc++] Switch FreeBSD to C++26 (PR #86658)

[Nikolas Klauser via cfe-commits]

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@@ -39,6 +39,9 @@
 # if defined(__HAIKU__)
 #  define _LIBUNWIND_TARGET_HAIKU 1
 # endif
+#if defined(__FreeBSD__)
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philnik777 wrote:

Are these changes related?

https://github.com/llvm/llvm-project/pull/86658