[Rpm-maint] [rpm-software-management/rpm] rpm leaks \x1f at argument boundaries in %global ... %(... %{?**}) (Issue #3145)

[Michael Schroeder]

See https://bugzilla.redhat.com/show_bug.cgi?id=2284187

Reproducer taken from comment #4:
```
$ cat prinargv.py 
import sys
print(sys.argv)
$ rpm --eval '%define macro(e:) %{-e:%global toxenv %(%{__python3} -s ./prinargv.py %{?**})}'  --eval '%macro -e1 -e 2' --eval '%toxenv'


['./prinargv.py', '\x1f-e1\x1f', '\x1f-e\x1f', '\x1f2\x1f']

```

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