[libc++] NFC: Remove symbol from ABI list changelog that was never added

The `posix_memalign@GLIBC_2.2.5` symbol can't have been added by r284206,
because it doesn't show up in the corresponding ABI list. It's also not
defined in libc++, so that wouldn't make sense. It must have made it into
that comment by mistake.

diff --git a/libcxx/lib/abi/CHANGELOG.TXT b/libcxx/lib/abi/CHANGELOG.TXT
index fe78178..c23f8c8 100644 (file)
--- a/libcxx/lib/abi/CHANGELOG.TXT
+++ b/libcxx/lib/abi/CHANGELOG.TXT
@@ -810,7 +810,6 @@ Version 4.0
 
   x86_64-linux-gnu
   ----------------
-  Symbol added: posix_memalign@GLIBC_2.2.5
   Symbol added: _ZdaPvSt11align_val_t
   Symbol added: _ZdlPvSt11align_val_t
   Symbol added: _ZnamSt11align_val_t