Add prepend and append modes for all our normal build scriptlets #2728
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Allows %build, %install, %check, %clean and %generate_depends to be augmented arbitrary number of times by appending or prepending to them. The main use-case is to support automatic population of these sections (declarative builds) while still allowing packagers to easily tweak them, but could also be useful for complicated conditional specs and such.
%prep is missing from the list because it's way too special at the moment, it'll gain this capability when #2205 is fixed.
Related: #1087