GDB13 fails to build on MacOS using supplied GNU Bison 2.3

[Tom Tromey]

> What type of tests did you have in mind when you, in a previous mail
> in the same thread, wrote:

>   If the appended works for you (be sure to run some tests), I can check
>   it in.

> Is it sufficient with a simple C project and a simple C++ project (my
> example was using std::vector to get some namespace and template
> expansion) built for arm-none-eabi? Those 2 projects appears to work
> as expected anyway.

Yes, that's plenty, thank you.
I'll check the patch in soon.

Tom