[Rpm-maint] [rpm-software-management/rpm] Implement %elif (issue #311) (#618)

[pavlinamv]

This is a new version of #613. All suggestions that are in #613 are included or in the discussion is described why they are not included.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/618

-- Commit Summary --

  * Refactor variable "match" to have clear meaning
  * Consolidate %if condition parsing to one place
  * Refactor expression expansion evaluation in parseSpec
  * Make "Bad %if condition" error message more informative
  * Supported operators: %elif, %elifarch, %elifos.
  * Add tests for %elif, %elifos, %elifarch

-- File Changes --

    M build/parseSpec.c (81)
    M build/rpmbuild_internal.h (11)
    M build/spec.c (2)
    A tests/data/SPECS/iftest.spec (116)
    M tests/rpmmacro.at (103)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/618.patch
https://github.com/rpm-software-management/rpm/pull/618.diff

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