perl-modules: do not create perllocal.pod, for determinism
makeInitrd: use deterministic compression
determinism: change some fixed timestamp to != (time_t)0

vcunat removed the unrelated glib change.
Conflicts:
	pkgs/development/libraries/glib/default.nix
	pkgs/os-specific/linux/kernel/generic.nix
	pkgs/os-specific/linux/kernel/manual-config.nix