Merge branch 'tcp-remove-rtx_syn_ack-and-inet_rtx_syn_ack'

Eric Dumazet says:

====================
tcp: remove rtx_syn_ack and inet_rtx_syn_ack()

After DCCP removal, we can cleanup SYNACK retransmits a bit.
====================

Link: https://patch.msgid.link/20250626153017.2156274-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>