Add LTO for argon2. LTO on my system gives an average reduction in time by 3.63260%. Tests were performed with the builtin benchmark and the gain in speed calculated with a script of mine.
Can we not make a big deal of this please? 0.5% is barely perceptile in keepasx and we aren't optimizing php to run on a web server, so it won't kill you there either. Also, if LTO makes this take even 50% longer to compile, it's a waste of your time and mine.
My new glasses could just be screwing with me here, but you may want to check your build log to validate we're actually building and then installing the man file (per your line 22 in package.yml). Because it's not in the pspec.