[Rpm-maint] [rpm-software-management/rpm] Handle missing RPMTAG_ARCH in RPMTAG_ARCHSUFFIX (PR #1941)

[Panu Matilainen]

RPMTAG_ARCHSUFFIX from commit e6a6399cb4c87f049bb75b8da83f5759522bcc58
assumes all headers have RPMTAG_ARCH, but a notable exception is gpg-pubkey
headers in rpmdb, causing segfaults on `rpm -qa` on normal systems.

Special case conditionals in queryformats get ugly and error-prone real
fast, which is why we have all the NEVRA formatter extensions. Avoid
adding yet more of those tags by handling the dot formatting in
ARCHSUFFIX instead - the "suffix" in the name seems to imply this
anyway.

Also add tests to cover the common -qa cases.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1941

-- Commit Summary --

  * Handle missing RPMTAG_ARCH in RPMTAG_ARCHSUFFIX

-- File Changes --

    M docs/manual/tags.md (2)
    M lib/tagexts.c (13)
    M macros.in (2)
    M tests/rpmdb.at (32)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1941.patch
https://github.com/rpm-software-management/rpm/pull/1941.diff

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