libgloss fix for bfin port

[Mike Frysinger]

On 16 Dec 2023 21:57, Jeff Law wrote:
> gcc-14 will complain loudly both for calling a function without an 
> in-scope prototype or when the in scope prototype differs from the known 
> signature.
> 
> "main" happens to be one of the functions the compiler knows about.  So 
> not only do we need to prototype it, we need to make sure the prototype 
> matches what GCC thinks it should be.
> 
> This fixes the bfin libgloss port to do the right thing for bfin-elf.
> 
> OK for the trunk?

OK

> --- a/libgloss/bfin/syscalls.c
> +++ b/libgloss/bfin/syscalls.c
> @@ -27,6 +27,8 @@
>  #include <reent.h>
>  #include <unistd.h>
>  
> +int main (int, char **, char **);

shouldn't it have `extern` for completeness at least ?

would be nice if we had more clarity on 2-vs-3 signature main in newlib,
but it's fine here to just set another register to 0 before calling.
-mike
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