Lua Parsing of Tracepoint Fields doesn't handle `__data_loc` correctly

[gorgonical]

Some arguments of tracepoint fields are of the format __data_loc char[] var, which is not being parsed correctly by the Lua tooling.

This problem is very similar to the one mentioned here: bpftrace/bpftrace#385

To fix this, I have taken the same approach proposed by @brendangregg in that issue of transforming them to char* instead.

src/lua/bpf/cdef.lua:

275,276c275
<          local g = string.gsub(f, "__data_loc char%[%]", "char*")
<          table.insert(fields, g)
---
>               table.insert(fields, f)

My approach right now is rather a hack, so please advise on what should be done.