* `std.os.execve` had the wrong name; it should have been
   `std.os.execvpe`. This is now corrected.
 * introduce `std.os.execveC` which does not look at PATH, and uses
   null terminated parameters, matching POSIX ABIs. It does not
   require an allocator.
 * fix typo nonsense doc comment in `std.fs.MAX_PATH_BYTES`.
 * introduce `std.os.execvpeC`, which is like `execvpe` except it
   uses null terminated parameters, matching POSIX ABIs, and thus
   does not require an allocator.
 * `std.os.execvpe` implementation is reworked to only convert
   parameters and then delegate to `std.os.execvpeC`.
 * `std.os.execvpeC` improved to handle `ENOTDIR`. See #3415