Hello folks!

Curl cmake build was regressed for MSVC since some past re-factoring.

The issue related to winsock2 detection after openssl already found (it
will include windows.h first).
In this case - winsock2 check will fail and marked as not found (issue
described here
http://stackoverflow.com/questions/1372480/c-redefinition-header-files).

I've solve this issue by explicit definition -D_WINSOCKAPI_ in
CMAKE_REQUIRED_DEFINITIONS for WIN32 build generation.
Also I've fixed tools_hugehelp.c generation using "cmake -E echo" command.

Could you please review and integrate?
Thank you.

Github pull request: https://github.com/bagder/curl/pull/131

-- 
Best Regards,
Sergei Nikulov

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