Enable multi-module support for wasm-c-api (#426)

it is allowed that all imported functions and globals can be
linked by multi-module feature automatically or by wasm-c-api manually

core/iwasm/common/wasm_runtime_common.h

@@ -373,6 +373,9 @@ void
 wasm_runtime_destroy_loading_module_list();
 #endif /* WASM_ENALBE_MULTI_MODULE */
 
+bool
+wasm_runtime_is_host_module(const char *module_name);
+
 bool
 wasm_runtime_is_built_in_module(const char *module_name);