[Rpm-maint] [rpm-software-management/rpm] Defining %global macro in %pre results empty in %post (#1440)

[Giovanni Bertoncelli]

I have to retrieve in the SPEC file the previous installed version of the package. I'm trying to define this custom macro inside %pre:
```spec
%pre
  PREVIOUS_VERSION=$(/path/to/executable --version)
  %global _prevver $(echo $PREVIOUS_VERSION)
```
I will use it in the %post phase:
```spec
%post
  export PREVIOUS_VERSION=%{_prevver}
```
but sadly the %{_prevver} macro is empty inside %post... Is there anything I'm missing? The %global macro should be global and therefore defined also in the %post phase...

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