testing/ocaml-migrate-parsetree: move ocamlbuild plugin into subpkg

testing/ocaml-migrate-parsetree/APKBUILD

@@ -9,7 +9,7 @@ arch="all !x86 !armhf !s390x"  # limited by ocaml
 license="LGPL-2.1-only-WITH-linking-exception"
 makedepends="dune ocaml ocamlbuild ocaml-findlib ocaml-result-dev opam"
 options="textrels"  # ppc64le (?!)
-subpackages="$pkgname-dev $pkgname-doc"
+subpackages="$pkgname-dev $pkgname-doc $pkgname-ocamlbuild"
 source="$pkgname-$pkgver.tar.gz::https://github.com/ocaml-ppx/$pkgname/archive/v$pkgver.tar.gz"
 builddir="$srcdir/$pkgname-$pkgver"
 
@@ -49,10 +49,18 @@ package() {
 	rmdir usr/doc
 }
 
+ocamlbuild() {
+	pkgdesc="$pkgdesc (ocamlbuild plugin)"
+	depends="$pkgname=$pkgver-r$pkgrel ocamlbuild"
+
+	mkdir -p "$subpkgdir"/usr/lib/ocaml
+	mv "$pkgdir"/usr/lib/ocaml/$pkgname-ocamlbuild "$subpkgdir"/usr/lib/ocaml/
+}
+
 dev() {
 	default_dev
 
-	depends="$pkgname=$pkgver-r$pkgrel"
+	depends="$pkgname=$pkgver-r$pkgrel $pkgname-ocamlbuild=$pkgver-r$pkgrel"
 	local sitelib="usr/lib/ocaml/$pkgname"
 
 	cd "$pkgdir"