I'm surprised this hasn't been discovered yet. Stephen just
discovered that the default return value (the value returned when a
specific control command is unimplemented) from the BIO *_ctrl()
functions is 0. However, that is also an "OK" value from a number of
the underlying functions, like fseek() and lseek(). This is a big
clash and shouldn't be acceptable.
However, it feels like it's a bit on the late side to change that, and
the change has enormous implications for those who have relied on 0
meaning "not implemented here".
Also, this is a bit confusing if we compare with BIO_read() and
BIO_write() who will return -2 if unimplemented.
Something to think of clearing out before 0.9.7, methinks.
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