[Rpm-maint] [rpm-software-management/rpm] RFE: Handle disttag (#589)

[wladmis]

> However, from ALT's point of view and ALT's practice, conceptually, there is a kind of package dependency which can be satisfied only if another package's disttag is equal to the value specified in this dependency.

I think it is off topic. I want to tell about this later, but this requires some background, for example, ALT `rpm-build` optimizes subpackages interdependencies (dependecies between packages built from one source package) to strict dependency. Historically, these strict dependecies was like `name = EVR`, but now it is even stricter because it contain a DistTag, as it can be seen in @imz example. But this can be *only* for packages built from one source code. Here is the [code that optimize interdeps](http://git.altlinux.org/gears/r/rpm-build.git?p=rpm-build.git;a=blob;f=build/interdep.c;h=cab619844724a5b920eac5785cfbea3867c5decb;hb=aa125cd61d1aed7e5d4bab57c236ccfafe7d8e1e#l780). I think this scheme won't be plainly adopted by other distributions but this is a concept you can view on and think about.

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