tradie

[`union sigval` and `struct sigevent`](https://github.com/kernelsauce/turbo/blob/master/turbo/cdef.lua#L219-L230) seem to be declared in syscall ([ljsyscall 0.12-1](https://github.com/justincormack/ljsyscall/commit/6f400364cd45c759122edc5b04af9e3c07df6b64#diff-e4369173ab4638f3d2bdba636c52fb4aR160)) so I get an error when I'm trying to load turbo. Moving them inside the [`if not...