coq: fix build with bytecode.

srcpkgs/coq/template

@@ -20,6 +20,13 @@ case "$XBPS_TARGET_MACHINE" in
 	ppc*) broken="R_PPC_REL24 relocation out of range";;
 esac
 
+do_patch() {
+	if ! command -v ocamlc.opt >/dev/null; then
+		# see coq/coq#18609
+		vsed -i -e 's/dep ^ ".cmxs"/dep ^ ".cma"/' tools/dune_rule_gen/coq_rules.ml
+	fi
+}
+
 do_build() {
 	make dunestrap
 	dune build --display=short -p coq-core,coq-stdlib,coqide-server