[PATCH] include: Avoid _onexit_t redefinition.

[Jacek Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48888
Signed-off-by: Jacek Caban 
---
  include/msvcrt/corecrt_startup.h | 3 +++
  include/msvcrt/stdlib.h          | 3 +++
  2 files changed, 6 insertions(+)