[PATCH] dlls/msvcrt/tests: Add tests for _vsnwprintf

[Hugh McMaster]

This patch adds tests for _vsnwprintf(NULL, 0, fmt, args) and _vsnwprintf(buffer, 0, fmt, args).

The tests were verified on the testbot here: http://testbot.winehq.org/JobDetails.pl?Key=10847
 		 	   		  
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