testing/ocaml-lambda-term: don't build on arches w/o ocaml and cppo

testing/ocaml-lambda-term/APKBUILD

@@ -6,7 +6,7 @@ pkgver=1.12.0
 pkgrel=0
 pkgdesc="Terminal manipulation library for OCaml"
 url="https://github.com/diml/lambda-term"
-arch="all"
+arch="all !x86 !armhf !s390x !ppc64le"  # limited by ocaml and ocaml-cppo aports
 license="BSD-3-Clause"
 depends="ocaml-camomile ocaml-lwt ocaml-lwt-react ocaml-zed"
 makedepends="