Static linking against libbsd on ubuntu-latest github runner seems broken

[mrdomino]

Originally from:
#180 (comment)

While trying to merge this change:

https://github.com/mrdomino/readpassphrase-3/pull/11/files#diff-d0d98998092552a1d3259338c2c71e118a5b8343dd4703c0c7f552ada7f9cb42R13-R17

I found that libbsd was winding up getting dynamically linked into my example binaries. You can see a build log line here that shows dynamic linking:

https://github.com/mrdomino/readpassphrase-3/actions/runs/17199525547/job/48787478567?pr=11#step:8:48

(NB. It’s also pulling in libmd, twice. 🤔)

I do not see any obvious reasons why I wouldn’t be getting a static dependency here, so filing an issue to follow up from the now-closed PR.

[mrdomino]

Fwiw, on a local Ubuntu machine I have:

% ls /usr/lib/aarch64-linux-gnu/libbsd*
/usr/lib/aarch64-linux-gnu/libbsd.a	  /usr/lib/aarch64-linux-gnu/libbsd.so.0
/usr/lib/aarch64-linux-gnu/libbsd-ctor.a  /usr/lib/aarch64-linux-gnu/libbsd.so.0.11.7
/usr/lib/aarch64-linux-gnu/libbsd.so
% cat /usr/lib/aarch64-linux-gnu/pkgconfig/libbsd.pc
prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/aarch64-linux-gnu
includedir=${prefix}/include

Name: libbsd
Description: Utility functions from BSD systems
Version: 0.11.7
URL: https://libbsd.freedesktop.org/
Libs: -L${libdir} -lbsd
Libs.private:   -lmd
Cflags: -I${includedir}

[mrdomino]

Oh, I see now; the doc comment for is_static_available says “System libraries should only be linked dynamically”.

Hrm. I think this is just a duplicate of #143 then.