So after putting this code into ‘emacs-generate-autoloads’ procedure
from (guix build emacs-utils) module, there will be zeros instead of
non-deterministic timestamps.

However this will fix only those packages, that use
‘emacs-generate-autoloads’ directly or via ‘emacs-build-system’.  But
there are also packages that generate autoloads on their own (for
example, 'emacs-w3m' or 'guix' itself).  What to do for these ones?

Perhaps we can make a special 'emacs-build' package (that will advise
‘autoload-insert-section-header’ function somehow) and use it as an
input for emacs-packages, or are there other ways?

-- 
Alex