[Rpm-maint] [rpm-software-management/rpm] Implement one-shot macro modifier <o> (PR #4169)

[Panu Matilainen]

A one-shot macro is expanded once on the first use, and the result of that expansion is pushed on the stack as a literal macro so it wont be expanded again. Using the stack this way allows one-shot macros to be re-armed by just undefining it once.

Things get a bit stranger with %global which expands the body once at the time of definition, and then once at the first use.

The first commit is basically just something forgotten from #4129.

Fixes: #1155

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

  https://github.com/rpm-software-management/rpm/pull/4169?email_source=notifications&email_token=ADLPZU62ZDVOK345GPNLVID4TISW7A5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINRUHEZTSNZYGOTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3POBSW4X3DNRUWG2Y

-- Commit Summary --

  * Render macro modifiers in --showrc output
  * Implement one-shot macro modifier <o>

-- File Changes --

    M docs/man/rpm-macros.7.scd (32)
    M rpmio/macro.cc (33)
    M tests/rpmmacro.at (67)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/4169.patch?email_source=notifications&email_token=ADLPZU7YHYKQHBJBYN574RD4TISW7A5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINRUHEZTSNZYGOTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVZYHEX3QMF2GG2C7MNWGSY3Lhttps://github.com/rpm-software-management/rpm/pull/4169.diff?email_source=notifications&email_token=ADLPZU3G3WEQ65YRAL7EKND4TISW7A5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINRUHEZTSNZYGOTHEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3ENFTGMX3DNRUWG2Y
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