[PATCH] Using alternative OpenSSL BIO API

A while ago I committed some changes to the way we interact with
OpenSSL to avoid crashes on Windows. Passing FILE* arguments between
DLLs is unsafe so I made libssh2 read the keys and pass them to
OpenSSL as a string. In my opinion, a better way to do this is to
pass OpenSSL the filename and allow *it* to read the keyfile. I've
attached a patch that does this.

It makes use of BIO_new_file function which is safe to use on Windows
as the FILE* stays on the OpenSSL side of the DLL boundary. One thing
to note is that this changes the common interface that openssl.c
shares with libgcrypt.c. However, as this is an internal interface, I
can't see it causing any problems.

Please take a look at the patch and comment or criticise. If I hear
nothing for a while, I'll commit.

Thanks.

Alex

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