[Rpm-maint] [rpm-software-management/rpm] add support for %{shrink:}, derived from rpm5.org (#234)

[Jeff Johnson]

@ignatenkobrain : you are correct that stink (or trim/rtrim or strip) isn't very useful for the common task of inserting strings into shell script lets: the shell is very forgiving of white space.

However, when using embedded %{lua:...} templates, or when using --queryformat, where macros are also expanded, extra whitespace or newlines can be a killer.

That is why %{shrink:...} was implemented.

(aside)
Note that if you are gonna mess with macros, then you might also consider stealing the macro-stack-to-tuple-list syntax.

An example perhaps shows what can be done best:
```
$ ./rpm -D'args foo' -D'args bar' -D'args baz' -E"%{@args:, }"
foo, bar, baz
```


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