[Rpm-maint] [rpm-software-management/rpm] Add preliminary support for dynamic built-in macro registration (#1406)

[Panu Matilainen]

Add the necessary infra to pass and carry dofoo/parse function pointers
in macro entries, define our basic built-in primitives at macro
initialization and adapt the built-in calling logic in expandMacro()
to look up the info from macro entry instead of the builtin table.

This has various nice benefits, such as allowing simple testing whether
rpm supports a given primitive by testing whether said macro is defined.
It also paves way for later implementing various spec constructs as
actual macros instead of the confusing pseudo-macros they are now.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1406

-- Commit Summary --

  * Add preliminary support for dynamic built-in macro registration

-- File Changes --

    M rpmio/macro.c (110)
    M tests/rpmmacro.at (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1406.patch
https://github.com/rpm-software-management/rpm/pull/1406.diff

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