vtls: consistently use typedef names for OpenSSL structs #12439
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The foo_st names don't appear in OpenSSL public API documentation. The FOO typedefs are more common. This header was already referencing SSL_CTX via <openssl/ssl.h>. There is a comment about avoiding <openssl/x509v3.h>, but OpenSSL actually declares all the typedefs in <openssl/ossl_typ.h>, which is already included by <openssl/ssl.h> (and every other OpenSSL header), so just use that. Though I've included it just to be explicit.
(I'm also fairly sure including <openssl/ssl.h> already triggers the Schannel conflicts anyway. The comment was probably just out of date.)