tccpp: cleanup

- "utf8 in identifiers"
  from 936819a1b9

- CValue: remove member str.data_allocated
- make tiny allocator private to tccpp

- allocate macro_stack objects on heap
  because otherwise it could crash after error/setjmp
  in preprocess_delete():end_macro()

- mov "TinyAlloc" defs to tccpp.c

- define_push: take int* str again

libtcc.c

@@ -2199,8 +2199,6 @@ PUB_FUNC int tcc_parse_args(TCCState *s, int argc, char **argv)
                 s->dflag = 3;
             else if (*optarg == 'M')
                 s->dflag = 7;
-            else if (*optarg == 'b')
-                s->dflag = 8;
             else
                 goto unsupported_option;
             break;