Bug 1737844 - Cleanup warnings when compiling generated wasm2c code r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D129540

security/rlbox/moz.build

@@ -45,6 +45,10 @@ FINAL_LIBRARY = "xul"
 # libraries), and C compiles (because they're code generated by wasm2c).
 AllowCompilerWarnings()
 
+SOURCES["!rlbox.wasm.c"].flags += [
+    "-Wno-unused",
+]
+
 WASM_DEFINES["MOZILLA_CLIENT"] = True
 WASM_DEFINES["_WASI_EMULATED_PROCESS_CLOCKS"] = True
 WASM_DEFINES["MOZ_IN_WASM_SANDBOX"] = True