[libc++] Fix build on macOS older than 10.15.
authorMarek Kurdej <marek.kurdej+llvm.org@gmail.com>
Fri, 2 Apr 2021 08:31:18 +0000 (10:31 +0200)
committerMarek Kurdej <marek.kurdej+llvm.org@gmail.com>
Fri, 2 Apr 2021 08:32:54 +0000 (10:32 +0200)
commit49e5a896d1fc0d18263da5f832b125176a4338ae
treef6835febc053aac10e7a9b4578960e56d0f8e1e6
parent2388aae401dcb0903b1aa904d2f810fcf30edbfc
[libc++] Fix build on macOS older than 10.15.

* This was introduced in D99515 that added -Wundef flag. CI run on macOS 10.15 and this problem wasn't caught before.
libcxx/include/__config