[Rpm-maint] [rpm-software-management/rpm] Implement support for literal and one-shot macro modifiers (PR #4129)

[Panu Matilainen]

More details in commit messages, but in brief: implement new `<modifier>` syntax for macro definitions, adding support for defining literal macros through the macro engine itself and macro files with `<l>`. Also implement one-shot macro modifier `<o>` that makes the macro body expand exactly once at the time of first use.

Fixes: #1155
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/4129

-- Commit Summary --

  * Refactor doArgvDefine() to use a C++ string for formatting the args
  * Minimally adjust doDefine() to take a C++ string as the string to parse
  * Refactor macro definition parsing to utilize C++ strings a bit
  * Use C++ string primitives for macro option parsing
  * Support defining literal macros via new <l> modifier syntax
  * Implement one-shot macro modifier <o>

-- File Changes --

    M docs/man/rpm-macros.7.scd (21)
    M include/rpm/rpmmacro.h (1)
    M rpmio/macro.cc (153)
    M tests/rpmmacro.at (106)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/4129.patch
https://github.com/rpm-software-management/rpm/pull/4129.diff

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