Avoid -Werror=old-style-declaration for stap_probes array in generated kernel modules

Avoid -Werror=old-style-declaration for stap_probes array in generated kernel modules

With newer linux kernels additional compilers checks are being done
and will get error messages like the following for the generated
module:

/tmp/stapuundLy/stap_2755fca707746de04395c85872aae4b8_1753_src.c:111:1: error: 'static' is not at beginning of declaration [-Werror=old-style-declaration]
  111 | } static stap_probes[];
      | ^
cc1: all warnings being treated as errors

Tweaked the code generation in translate.cxx to output the static
stap_probes array in a form that is agreeable to newer kernel builds.