[PATCH 1/3 v2] ucrtbase: Support overriding return value in _matherr.

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcrt/math.c         | 130 ++++++++++++++++++++-----------------
  dlls/ucrtbase/tests/misc.c |   7 ++
  2 files changed, 76 insertions(+), 61 deletions(-)