[libc++] Fix test_macros.h in the same way as commit 49e5a896 fixed __config.
authorArthur O'Dwyer <arthur.j.odwyer@gmail.com>
Sun, 4 Apr 2021 22:05:12 +0000 (18:05 -0400)
committerArthur O'Dwyer <arthur.j.odwyer@gmail.com>
Sun, 4 Apr 2021 22:08:19 +0000 (18:08 -0400)
commit9abff04e506fe0b86485909434d4dc3b6011c463
treedd55bbade8072b2616407e93eda25b69205acc54
parent27e5bffbf62cb13638102c7d3de1f386e39f0373
[libc++] Fix test_macros.h in the same way as commit 49e5a896 fixed __config.

Since D99515, this header triggers -Wundef on Mac OSX older than 10.15.
This is now fixed.
libcxx/test/support/test_macros.h