[PATCH] ucrtbase: Fix _Syserror_map behavior on unknown error.

[Piotr Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=50407
Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcp120/tests/msvcp120.c | 14 ++++++++++++++
  dlls/msvcp140/tests/msvcp140.c | 15 +++++++++++++++
  dlls/msvcp90/misc.c            |  4 ++++
  3 files changed, 33 insertions(+)