sync with const changes in bio.h r1.45.

finish crypto HISTORY; mostly 1.1.0/6.3, but also various other fixes

In bio.h rev. 1.34 2018/02/20 17:15:27, jsing@ provided
BIO_get_new_index(3), in rev. 1.37 2018/02/20 18:13:31, tb@ provided
BIO_meth_get_read(3), BIO_meth_get_puts(3), BIO_meth_get_gets(3),
BIO_meth

In bio.h rev. 1.34 2018/02/20 17:15:27, jsing@ provided
BIO_get_new_index(3), in rev. 1.37 2018/02/20 18:13:31, tb@ provided
BIO_meth_get_read(3), BIO_meth_get_puts(3), BIO_meth_get_gets(3),
BIO_meth_get_ctrl(3), BIO_meth_get_create(3), and BIO_meth_get_destroy(3),
and in rev. 1.38 2018/02/20 18:17:17 BIO_meth_get_callback_ctrl(3)
and BIO_meth_set_callback_ctrl(3).
BIO_meth_get_write(3) will become public with the next minor bump.
Merge the documentation from OpenSSL, tweaked by me, OK tb@.

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In bio.h rev. 1.33 2018/02/18 12:59:06, tb@ provided BIO_meth_set_gets(3).
Merge the documentation from OpenSSL.

In bio.h rev. 1.31 2018/02/17 13:57:14, tb@ provided new functions
BIO_meth_*(). Import the documentation from OpenSSL, with extensive
tweaks by me.