[Rpm-maint] [rpm-software-management/rpm] rpm expands macro args twice (#217)

[Michael Schroeder]

If you have a
```
%foo() %1
```
macro, `rpm --eval "%{foo xx%%%%}"` used to print `xx%%`, but now just prints `xx%`. This is because commit 5adc56897b9da5dac49701f704ef54390db57c59 added an extra expansion call.

I think that all % characters need to be replaced by %% after the expansion or some similar fix.

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