Fixed "changing binary" when reaper is not init. On some systems, it's possible that reaper of orphaned processes is set to something other than "init" process. On such systems, the changing binary procedure did not work. The fix is to check if PPID has changed, instead of assuming it's always 1 for orphaned processes.

--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -31,6 +31,7 @@ static void ngx_cache_loader_process_han
 ngx_uint_t    ngx_process;
 ngx_uint_t    ngx_worker;
 ngx_pid_t     ngx_pid;
+ngx_pid_t     ngx_parent;
 
 sig_atomic_t  ngx_reap;
 sig_atomic_t  ngx_sigio;