Defines starting with `a' in bsd/kern

• accept1 bsd/kern/uipc_syscalls.c:245
• ALPHA bsd/kern/tty.c:159
• AST_BSD bsd/kern/ast.h:40
• AST_BSD_INIT bsd/kern/ast.h:41
• AST_NONE bsd/kern/ast.h:39