The `MEMOIZE_LOOKAROUND_MATCH_CACHE_POINT` macro needs an argument
otherwise we end up with:

```
../regexec.c:3955:2: error: called object type 'void' is not a function or function pointer
 3955 |         STACK_POS_END(stkp);
      |         ^~~~~~~~~~~~~~~~~~~
../regexec.c:1680:41: note: expanded from macro 'STACK_POS_END'
 1680 |     MEMOIZE_LOOKAROUND_MATCH_CACHE_POINT(k);\
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
../regexec.c:3969:7: error: called object type 'void' is not a function or function pointer
 3969 |       STACK_POP_TIL_POS_NOT;
      |       ^~~~~~~~~~~~~~~~~~~~~
../regexec.c:1616:41: note: expanded from macro 'STACK_POP_TIL_POS_NOT'
 1616 |     MEMOIZE_LOOKAROUND_MATCH_CACHE_POINT(stk);\
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
```

The macro definition with the match cache enabled already has the
correct argument. This one is for when the match cache is disabled (I
had disabled it while trying to learn more about how it works.)