A patch for my previous patch

So I tried building my previous patch under Snow Leopard. It built okay, but in practice it didn't work at
all, because the context wasn't being initialized, because I accidentally removed that from the code.
Oops. This patch for curl_darwinssl.c fixes some problems in the previous patch that caused TLS/SSL to
not work under versions of OS X older than Mountain Lion.

Nick Zitzmann
<http://www.chronosnet.com/>

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