Memory chunk is allocated with `malloc` and used as the `dest` buffer
for `strncat`. The `dest` argument in `strncat` has to be NUL terminated,
however it was not.
This commit fixes this issue in mk{fifo,nod,noat}.c.
Almost all dynamic tests pass now.
Signed-off-by: Anhad Singh <andypython@protonmail.com>