Refactoring BIO: new socket-handling functions, deprecate older ones

Added functions:

BIO_socket
BIO_connect
BIO_listen
BIO_accept_ex
BIO_closesocket
BIO_sock_info

These get deprecated:

BIO_gethostbyname
BIO_get_port
BIO_get_host_ip
BIO_get_accept_socket
BIO_accept

Reviewed-by: Kurt Roeckx <kurt@openssl.org>

crypto/err/err.c

diff --git a/crypto/err/err.c b/crypto/err/err.c
index 13757c2..6cb582d 100644
--- a/crypto/err/err.c
+++ b/crypto/err/err.c
@@ -175,6 +175,9 @@
     {ERR_PACK(0, SYS_F_FREAD, 0), "fread"},
     {ERR_PACK(0, SYS_F_GETADDRINFO, 0), "getaddrinfo"},
     {ERR_PACK(0, SYS_F_GETNAMEINFO, 0), "getnameinfo"},
+    {ERR_PACK(0, SYS_F_SETSOCKOPT, 0), "setsockopt"},
+    {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},
+    {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},
     {0, NULL},
 };