[Rpm-maint] [rpm-software-management/rpm] `%global` run twice causing duplicated opts (Discussion #3871)

[frenzymadness]

I have a simple specfile, and I need to add one flag (`I`) into `%py3_shbang_opts`. `%py3_shbang_opts` is defined in `macros.python3` as `-s` on RHEL 8 and `-sP` on Fedora but that does not matter.

I have the following global at the very beginning of the specfile:
```
%global py3_shbang_opts %{py3_shbang_opts}I
```

and the result I can simply echo in `%prep` is: `sPII`. Why is there the `I` twice? Is the beginning of the specfile interpreted twice?

Interestingly, this happens only if the aforementioned `%global` is called anywhere in the top section of the specfile if at least one tag follows it. It seems like the tags are read and then the whole specfile is read and interpreted for the second time, causing the `I` flag to be added twice.

Is this a known problem?

A workaround is to use `sed` to make sure the `I` is there only once, no matter how many times the definition is called.

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