compilation: Ubuntu 26.04 libboost no longer includes asio #600

it's gone from the package list as of boost 1.90

However:

libasio-dev/resolute,resolute,now 1:1.30.2-1build1 all [installed]
cross-platform C++ library for network programming

libasio-doc/resolute,resolute,now 1:1.30.2-1build1 all [installed]
documentation for asio C++ library for network programming