kernel32: use TEB-based buffer in CreateMutexExA

[Andrey Turkin]

As described in bug 21777, an application bug exposes difference
in CreateMutexExA implementations between native and Wine. Use
thread-local buffer instead of stack-based, as done in GetBinaryTypeA
and filename-related functions.
---
  dlls/kernel32/sync.c |    9 ++++++---
  1 files changed, 6 insertions(+), 3 deletions(-)


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