[Rpm-maint] [rpm-software-management/rpm] Refactor parameter handling of builtin macros (PR #1809)

[Michael Schroeder]

%expand is not ME_PARSE, so it grabs the args till the end of line. It also does arg splitting and just uses the first arg, which is maybe not what we want:
```
./rpm --eval '%expand hello world'
hello
```
We could disable the arg splitting with some new flag, but I don't think builtins should be too different to normal macros. People anyway use `%{macro:arg}` where we do not split.

%lua is somewhat special because we do not want macro expansion to happen at all.

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