socklen_t and curl.h strikes back !

Since libcurl 7.17.1 curl.h needs an already defined socklen_t type.

This has already been addressed in CVS version for WIN32 platforms.
But we still miss a proper fix for any other platform that lacks the
socklen_t definition.

Platforms capable of running the configure script are already writing
out a socklen_t replacement in config.h when socklen_t is not
available.

Maybe some magic could be done, when needed, to also write the
socklen_t replacement in curl/type.h and include this from curl.h

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-=[Yang]=-