tls: include signature_algorithms extension in client hello message

function                                             old     new   delta
tls_xread_record                                     629     645     +16
.rodata                                           105167  105179     +12
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 28/0)               Total: 28 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed