Fix illumos/solaris build, member aliases only

[devnexen]

exposed in kernel level so available for userland here.

[codecov]

Codecov Report

Merging #4109 (2c6d264) into master (490ef86) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4109   +/-   ##
=======================================
  Coverage   48.76%   48.77%           
=======================================
  Files          71       71           
  Lines       14269    14269           
=======================================
+ Hits         6958     6959    +1     
+ Misses       7311     7310    -1     

Impacted Files	Coverage Δ
src/os/async_thread.cc	66.66% <0.00%> (-1.32%)	⬇️
src/server/port.cc	50.27% <0.00%> (+0.27%)	⬆️
src/protocol/base.cc	63.15% <0.00%> (+1.97%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 490ef86...2c6d264. Read the comment docs.