All symbols starting with `a' in src/tools

• ac_clean_files src/tools/configure:401
• ac_dummy src/tools/configure:540
• ac_optarg src/tools/configure:71
• ac_save_ifs src/tools/configure:538
• ac_unique_file src/tools/configure:466
• ac_word src/tools/configure:542
• _ALL_SOURCE src/tools/configure:873