[Rpm-maint] [rpm-software-management/rpm] The escape mechanism in macro expansion only works for %% (#1055)

[Michael Schroeder]

I think this should print `hel%loo`:
```
rpm --define 'foo() %1' --define 'loo what' --define 'bar hel%(echo %)loo' --eval '%{foo %bar}'
```
IMHO we should rip out mb->escape and instead double all '%' characters in the argv.

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