Include sys/wait.h which is a more common location. U813-014

Change-Id: Ic76574f88de3af19f8e0bad491a443264876bc04

Author: t-14

src/os/unix/process-wrappers.c

@@ -26,7 +26,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <wait.h>
+#include <sys/wait.h>
 #include <signal.h>
 
 typedef long long int sint_64;