Allow missing imports in wasm loader and report error in wasm instantiation instead (#3539)

The wasm loader is failing when multi-module support is on and the dependent
modules are not found; this enforces the AOT compiler integrations to prepare
dependent modules while it isn't necessary.

This PR allows allows missing imports in wasm loader and report error in wasm
instantiation instead, which enables the integrated AOT compiler to work as if
the multi-module support isn't turned on.

core/iwasm/common/wasm_runtime_common.c

@@ -1267,6 +1267,9 @@ wasm_runtime_is_built_in_module(const char *module_name)
             || !strcmp("wasi_snapshot_preview1", module_name)
 #if WASM_ENABLE_SPEC_TEST != 0
             || !strcmp("spectest", module_name)
+#endif
+#if WASM_ENABLE_WASI_TEST != 0
+            || !strcmp("foo", module_name)
 #endif
             || !strcmp("", module_name));
 }