[Rpm-maint] [rpm-software-management/rpm] Add %optional tag (#417)

[Bernhard Rosenkraenzer]

Add the %optional tag from rpm5 -- it allows to mark a file in the file
list as optional, meaning if it's there, it's packaged, but if it isn't
there, it will be ignored.

A typical use case is
%optional %{_includedir}/arch-specific-file.h
(easier and shorter than using %ifarch and having to list all
architectures that have the file -- will also automatically do the right
thing on a new architecture being added)

Another typical use case is in autogenerated file lists, e.g.
per-language subpackages in the likes of libreoffice where all languages
include translations, some languages additionally include dictionaries,
etc. -- with %optional, the same file list can be used for every
language subpackage.

Signed-off-by: Bernhard Rosenkränzer <bero at lindev.ch>
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/417

-- Commit Summary --

  * Add %optional tag

-- File Changes --

    M build/files.c (5)
    M lib/rpmfiles.h (1)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/417.patch
https://github.com/rpm-software-management/rpm/pull/417.diff

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