Fix various v850 problems

[Jeff Johnston]

Please go ahead.

-- Jeff J.

On Sun, Dec 17, 2023 at 12:20 AM Jeff Law <jeffreyalaw@gmail.com> wrote:

>
> These fixes fall into a few different buckets.  First c99 doesn't allow
> a parameter without a type.  So in cases where the type had previously
> been an implicit int, make it an explicit int.  Second, for return
> values, don't allow them to be implicit ints either, make them explicit.
> In a few cases change c89 function definitions to c99 function
> definitions.   Lastly include <stdlib.h> in sbrk.c to get the prototype
> for abort () which we call when we detect a heap/stack collision.
>
> OK for the trunk?
>
> Thanks,
> Jeff
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