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ok jsing@

Implement new-style OpenSSL BIO callbacks

This provides support for new-style BIO callbacks in
BIO_{read,write,gets,puts}() and a helper function to
work out whether it should call the new or the ol

Implement new-style OpenSSL BIO callbacks

This provides support for new-style BIO callbacks in
BIO_{read,write,gets,puts}() and a helper function to
work out whether it should call the new or the old
style callback. It also adds a few typedefs and minor
code cleanup as well as the BIO_{get,set}_callback_ex()

from jsing, ok tb

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Add a new, mostly empty, bio_local.h and include it in the files
that will need it in the upcoming bump.

discussed with jsing

Add const to the argument of the following callback getters:
BIO_meth_get_callback_ctrl, BIO_meth_get_create, BIO_meth_get_ctrl,
BIO_meth_get_destroy, BIO_meth_get_gets, BIO_meth_get_puts,
BIO_meth_g

Add const to the argument of the following callback getters:
BIO_meth_get_callback_ctrl, BIO_meth_get_create, BIO_meth_get_ctrl,
BIO_meth_get_destroy, BIO_meth_get_gets, BIO_meth_get_puts,
BIO_meth_get_read, and BIO_meth_get_write.

ok jsing

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whitespace nit

Provide BIO_meth_{g,s}et_callback_ctrl()

with & ok jsing

Provide BIO_meth_get_{create,ctrl,destroy,gets,puts,read}()

ok jsing

Provide BIO_meth_set_gets().

ok jsing

Provide BIO_meth_{free,new}() and BIO_meth_set_{create,crtl,destroy}()
and BIO_meth_set_{puts,read,write}().

ok jsing