[Rpm-maint] [rpm-software-management/rpm] Consider available memory and address space for parallel execution (PR #2418)

[Panu Matilainen]

See commits for details, but short summary: add optional proc/thread argument to %{getncpus} macro which consider the available memory and address space, based on newly added tunables for tasksize. 

The goal here is to avoid build failures due to gross overallocation on constrained systems, and to allow packagers to easily adjust for gigantic builds.

Fixes: #804 
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2418

-- Commit Summary --

  * Add optional total/proc/thread arguments to %{getncpus} macro
  * Make rpmio parallelism memory aware
  * Make build parallelism memory and address-space aware (#804)

-- File Changes --

    M build/build.c (9)
    M docs/manual/macros.md (5)
    M macros.in (11)
    M rpmio/macro.c (91)
    M rpmio/rpmio.c (2)
    M tests/rpmmacro.at (24)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2418.patch
https://github.com/rpm-software-management/rpm/pull/2418.diff

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