Disable -bs-cross-module-opt for tests #4994

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	36s
build-compiler (ubuntu-latest, ocaml-variants.5.2.0+options,ocaml-option-static, true, true, true)	1m 44s
build-rewatch (macos-14, aarch64-apple-darwin)	12s
build-compiler (buildjet-2vcpu-ubuntu-2204-arm, ocaml-variants.5.2.0+options,ocaml-option-static,...	1m 40s
build-rewatch (ubuntu-latest, x86_64-unknown-linux-musl)	10s
build-compiler (macos-13, 5.2.0, true)	2m 11s
build-rewatch (buildjet-2vcpu-ubuntu-2204-arm, aarch64-unknown-linux-musl)	16s
build-compiler (macos-14, 5.2.0, true)	1m 56s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	18s
build-compiler (windows-latest, 5.2.0, true)	2m 9s
build-compiler (ubuntu-latest, ocaml-variants.5.0.0+options,ocaml-option-static)	1m 23s
build-compiler (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-static)	1m 21s
build-compiler (ubuntu-latest, ocaml-variants.4.13.0+options,ocaml-option-static)	1m 11s
package	1s
installationTest	1s
publish	1s
	15m 10s

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