Fixed VLA definition because not every compiler supports that

[atvise]

No description provided.

[weltling]

Fair enough, support for VLA on is not certain. Leaving aside Visual Studio, rare platforms could be hurt.

Thanks.

[carlos-granados]

This has been merged into a maintained fork here fast-debug#2

[robocoder]

#424 duplicates #326 but takes a different approach to address the lack of VLA support in MSVC.

Can we pick one approach and use a wrapper, e.g.,?

#if __STDC_NO_VLA__
        zval* arguments = static_cast<zval*>(alloca(argc * sizeof(zval)));
#else
        zval arguments[argc];
#endif