[Rpm-maint] [rpm-software-management/rpm] RFE: access to multivalued flags (#546)

[nim-nim]

many commands nowadays accept multiple instances of the same flag (for example dnf can take several -x flags with different values)

when you write a macro that calls such a command you want to use the same syntax and have  %{?-x} output all the -x flags 

unfortunately rpm "helpfully" shortens %{?-x} to just the last one

since changing this would probably break compatibility somewhere, please add a %{?-x**} shorthand meaning all the -x flags with their values

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