Enable `-use-separate-modules` as default for all platforms

src/build_settings.cpp

@@ -1719,13 +1719,11 @@ gb_internal void init_build_context(TargetMetrics *cross_target, Subtarget subta
 
 	bc->optimization_level = gb_clamp(bc->optimization_level, -1, 3);
 
-#if defined(GB_SYSTEM_WINDOWS)
 	if (bc->optimization_level <= 0) {
 		if (!is_arch_wasm()) {
 			bc->use_separate_modules = true;
 		}
 	}
-#endif
 
 
 	// TODO: Static map calls are bugged on `amd64sysv` abi.