Refine codes and fix several issues (#1094)

Add aot relocation for ".rodata.str" symbol to support more cases
Fix some coding style issues
Fix aot block/value stack destroy issue
Refine classic/fast interpreter codes
Clear compile warning of libc_builtin_wrapper.c in 32-bit platform

core/iwasm/interpreter/wasm_runtime.c

@@ -1099,18 +1099,12 @@ check_linked_symbol(WASMModuleInstance *module_inst, char *error_buf,
             && !func->import_func_linked
 #endif
         ) {
-#if WASM_ENABLE_SPEC_TEST != 0
-            set_error_buf(error_buf, error_buf_size,
-                          "unknown import or incompatible import type");
-            return false;
-#else
 #if WASM_ENABLE_WAMR_COMPILER == 0
             LOG_WARNING("warning: failed to link import function (%s, %s)",
                         func->module_name, func->field_name);
 #else
             /* do nothing to avoid confused message */
 #endif /* WASM_ENABLE_WAMR_COMPILER == 0 */
-#endif /* WASM_ENABLE_SPEC_TEST != 0 */
         }
     }