build: optimize wasm with bulk memory support

Run wasm-opt separately after build to enable bulk memory.

This fixes compilation problems with rust nightly.

Issue: BTC-0

Author: OttoAllmendinger

packages/wasm-miniscript/Makefile

@@ -1,12 +1,18 @@
 WASM_PACK = wasm-pack
+WASM_OPT = wasm-opt
 WASM_PACK_FLAGS = --no-pack --weak-refs
 
 ifdef WASM_PACK_DEV
 	WASM_PACK_FLAGS += --dev
 endif
 
 define WASM_PACK_COMMAND
-	$(WASM_PACK) build --out-dir $(1) $(WASM_PACK_FLAGS) --target $(2)
+	$(WASM_PACK) build --no-opt --out-dir $(1) $(WASM_PACK_FLAGS) --target $(2)
+endef
+
+# run wasm-opt separately so we can pass `--enable-bulk-memory`
+define WASM_OPT_COMMAND
+    $(WASM_OPT) --enable-bulk-memory -Oz $(1)/*.wasm -o $(1)/*.wasm
 endef
 
 define REMOVE_GITIGNORE
@@ -22,6 +28,7 @@ endef
 define BUILD
 	rm -rf $(1)
 	$(call WASM_PACK_COMMAND,$(1),$(2))
+	$(call WASM_OPT_COMMAND,$(1))
 	$(call REMOVE_GITIGNORE,$(1))
 	$(call SHOW_WASM_SIZE,$(1))
 endef