[Rpm-maint] [rpm-software-management/rpm] Add prepend and append modes for all our normal build scriptlets (PR #2728)

[Panu Matilainen]

@pmatilai commented on this pull request.



> @@ -461,6 +461,13 @@ when name is omitted, the description refers to the main package.
 Package build is divided into multiple separate steps, each executed
 in a separate shell.
 
+Only one of each section can be present in a spec, but all build scriptlets
+except for `%prep` accept options `-a` and `-p`, for append and prepend mode.
+Append and prepend append or prepend lines to the section in the order they
+appear in the spec. Both append and prepend can be used multiple times and
+without other restrictions, but a section without either mode can only
+appear first (eg `%build` cannot follow `%build -p`).

Turns out what felt artificial, was in fact an artificial limit of the implementation. 
https://github.com/rpm-software-management/rpm/pull/3047 does away with that limitation, -a/-p are always applied relative to the main section if it exists, otherwise the first fragment is used as the base. Makes a lot more sense that way.

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