c20f88c6f3
Without this patch, people overriding systemd like:
```
systemd.package = pkgs.systemd.overrideAttrs (finalAttrs: previousAttrs: {
version = "255.9";
src = previousAttrs.src.override {
rev = "v${finalAttrs.version}";
hash = "sha256-fnMvBYyMRQrP2x//8ntGTSwoHOtFk2TQ4S5fwcsSLDU=";
};
});
```
would get the wrong version reported in `systemctl --version`
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