Split qnx target based on target env

- Created nto7071 and nto80 modules.
- Merged neutrino.rs into parent module.

Author: AkhilTThomas

src/unix/nto/aarch64.rs

@@ -1,8 +1,5 @@
 use crate::prelude::*;
 
-pub type wchar_t = u32;
-pub type time_t = i64;
-
 s! {
     pub struct aarch64_qreg_t {
         pub qlo: u64,