refactor: remove unused action builder functions

Signed-off-by: Rudi Grinberg <me@rgrinberg.com>

<!-- ps-id: e083ba7a-19b2-4e49-86a9-a10b706d83c4 -->

src/dune_engine/action_builder.ml

@@ -62,14 +62,6 @@ let paths_matching_unit ~loc g = ignore (paths_matching ~loc g)
 let dyn_paths paths = dyn_deps (paths >>| fun (x, paths) -> x, Dep.Set.of_files paths)
 let dyn_paths_unit paths = dyn_deps (paths >>| fun paths -> (), Dep.Set.of_files paths)
 
-let dyn_path_set paths =
-  dyn_deps (paths >>| fun (x, paths) -> x, Dep.Set.of_files_set paths)
-;;
-
-let dyn_path_set_reuse paths =
-  dyn_deps (paths >>| fun paths -> paths, Dep.Set.of_files_set paths)
-;;
-
 let env_var s = deps (Dep.Set.singleton (Dep.env s))
 
 let contents =
@@ -259,5 +251,3 @@ let progn ts =
   let open With_targets.O in
   With_targets.all ts >>| Action.Full.reduce
 ;;
-
-let dyn_of_memo_deps t = dyn_deps (dyn_of_memo t)

src/dune_engine/action_builder.mli

@@ -100,8 +100,6 @@ val dyn_memo_deps : (Dep.Set.t * 'a) Memo.t -> 'a t
 val dyn_paths : ('a * Path.t list) t -> 'a t
 
 val dyn_paths_unit : Path.t list t -> unit t
-val dyn_path_set : ('a * Path.Set.t) t -> 'a t
-val dyn_path_set_reuse : Path.Set.t t -> Path.Set.t t
 
 (** [contents path] returns a description that when run will return the contents
     of the file at [path]. *)
@@ -148,7 +146,3 @@ val create_file : ?perm:Action.File_perm.t -> Path.Build.t -> Action.Full.t With
 
 (** Merge a list of actions accumulating the sets of their targets. *)
 val progn : Action.Full.t With_targets.t list -> Action.Full.t With_targets.t
-
-(** A version of [dyn_of_memo] that makes it convenient to declare dynamic
-    action dependencies. *)
-val dyn_of_memo_deps : ('a * Dep.Set.t) Memo.t t -> 'a t

src/dune_engine/action_builder0.ml

@@ -247,5 +247,3 @@ let of_memo_join f =
         t.f mode)
   }
 ;;
-
-let dyn_of_memo f = f >>= of_memo

src/dune_engine/action_builder0.mli

@@ -73,11 +73,6 @@ val of_memo : 'a Memo.t -> 'a t
 (** Like [of_memo] but collapses the two levels of [t]. *)
 val of_memo_join : 'a t Memo.t -> 'a t
 
-(** If you're thinking of using [Process.run] here, check that: (i) you don't in
-    fact need [Command.run], and that (ii) [Process.run] only reads the declared
-    build rule dependencies. *)
-val dyn_of_memo : 'a Memo.t t -> 'a t
-
 (** {1 Execution} *)
 
 (** Evaluation mode.