[Rpm-maint] [rpm-software-management/rpm] Random failure on v6 multisignature test (Issue #3853)

[Panu Matilainen]

pmatilai created an issue (rpm-software-management/rpm#3853)

Every now and then, `rpmsign signature multisig v6` test fails with the signature header size being off by 4 after the build+sign:

```
 File offset: 96
 Header magic: 1e8ad8e (reserved: 0)
 Index entries: 5 (80 bytes)
-Data size: 4787 bytes
-Header size: 4867 bytes
-Padding: 5 bytes
+Data size: 4783 bytes
+Header size: 4863 bytes
+Padding: 1 bytes
 Region entries 5
 Region size 96
 Dribbles: 0
@@ -12,7 +12,7 @@
 Tag #0 [region]
        tagno:    62 (Headersignatures)
        type:      7 (blob)
-       offset: 4771
+       offset: 4767
        count:    16

        region trailer
@@ -36,13 +36,13 @@
 Tag #3 [region]
        tagno:   279 (Sha3_256)
        type:      6 (string)
-       offset:  578
+       offset:  574
        count:     1

 Tag #4 [region]
        tagno:   999 (Reserved)
        type:      7 (blob)
-       offset:  643
+       offset:  639
        count:  4128
```

I've only remember seeing this in the last week or so, but of course the test that catches this has only been there about for a month (1c685659439f23ecea82736c11257c6dc59fe117) so who knows how long it's been there. 

Only happens with v6 packages though so that's a clue.

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