[Rpm-maint] [rpm-software-management/rpm] add brp helper scripts from mandriva's spec-helper (#122)

[Panu Matilainen]

I've nothing against adding more brp-scripts as such, I haven't looked at this in any detail but there seems to be useful stuff in there. 

Enabling such a big pile of new stuff by default is a wholly different question, but lets not get hung up on that. The other complaint wrt enablement is that "dont" as a disabler doesn't sound right, "brp" stands for build root policy and enable/disable seem more fitting terminology for that. On a related note, whatever the means of enabling and disabling these policies ends up being, it needs to cover the pre-existing policies too, but that's beyond the scope of this PR. Neither of these issues prevents getting the scripts themselves in.

I do have some issues with the script names, they're fairly hodge-podgey and not very descriptive in places. Not that the ones currently upstream truly follow any defined pattern but lets not make that situation worse.

On a related note, looking at this many brp-scripts at once makes it painfully obvious how stupid the whole mechanism is. Every script repeats the same work over and over again, so we end up checking for buildroot and running find after find after find. I'd think all this could be coupled with the file classifier: eg the file classifier already knows if there are ELF files in the buildroot, and we could use that info to only run ELF-related brp-scripts when actually needed. Etc.

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