[PATCH] msvcrt: Use InitOnceExecuteOnce to allocate TLS index.

[Piotr Caban]

Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcrt/concurrency.c | 26 ++++++++++++++------------
  1 file changed, 14 insertions(+), 12 deletions(-)