This partially reverts 3c1eee5bed.
I thought that it is not necessary, but
https://mesonbuild.com/Reference-manual_functions.html#vcs_tag says:
> This method returns a custom_tgt should be used to signal dependencies if
> other targets use the file outputted by this.
>
> For example, if you generate a header with this and want to use that in a
> build target, you must add the return value to the sources of that build
> target. Without that, Meson will not know the order in which to build the
> targets.
We can use version_h directly, since we already have it.
Hopefully fixes https://github.com/systemd/systemd/issues/28994.
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