crypt32.dll: Check the result of CryptAcquireContextW() when initializing default provider

[Paul Chitescu]

Changelog:
	crypt32.dll: Check the result of CryptAcquireContextW() when initializing 
default provider.

Return the content of hDefProv just in case a "fortunate race condition" 
manages to initialize it from another thread. This looks weird but the current 
code didn't prevent it either.

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