installation.sgml says our minimum meson version is 0.54, but it's
silent on what the minimum ninja version is. What RHEL8 supplies
doesn't work for me:
$ meson setup build
...
Found ninja-1.8.2 at /usr/bin/ninja
ninja: error: build.ninja:7140: multiple outputs aren't (yet?) supported by
depslog; bring this up on the mailing list if it affects you
WARNING: Could not create compilation database.
That's not a huge problem in itself, but I think we should figure
out what's the minimum version that works, and document that.
regards, tom lane
