[PATCH] msvcr120: Fixed bugs in Concurrency::critical_section.

[Piotr Caban]

Hi,

the tests are failing on both wine and windows with following message:
msvcr120.c:303: Test failed: execution timed out, critical section 
probably not functioning correctly
msvcr120: 155 tests executed (0 marked as todo, 1 failure), 0 skipped.
It takes ~14 seconds to run the tests here. You also left "#include 
"stdio.h" line in the tests.

The change in critical_section class implementation looks good for me.

Cheers,
Piotr