[Rpm-maint] [rpm-software-management/rpm] Support new %[ ] expression expansion syntax (#846)

[Michael Schroeder]

This adds %[ expr ] as a new means to do expression expansion in rpm. Unlike %{expr:} the expression is expanded in the parser, so we are safe against expansion results messing up the syntax and also can to short-circuiting.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/846

-- Commit Summary --

  * Add findMacroEnd() function to find the end of a macro call
  * Add support for primary expansion to the expression parser

-- File Changes --

    M build/parseSpec.c (2)
    M rpmio/Makefile.am (2)
    M rpmio/expression.c (73)
    M rpmio/macro.c (130)
    M rpmio/rpmmacro.h (9)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/846.patch
https://github.com/rpm-software-management/rpm/pull/846.diff

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