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Tentatively fix complaint about "dubious use of 'dune subst'"

Changed files
+1 -1
packages
semver
semver.0.2.1
+1 -1
packages/semver/semver.0.2.1/opam
···
opam-version: "2.0"
build: [
-
["dune" "subst"] {pinned}
+
["dune" "subst"] {dev}
["dune" "build" "-p" name "-j" jobs]
["dune" "runtest" "-p" name "-j" jobs] {with-test}
["dune" "build" "-p" name "@doc"] {with-doc}