[test-suite] tools/timeit: Use setpgid() instead of the deprecated setpgrp().

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@153042 91177308-0d34-0410-b5e6-96231b3b80d8

tools/timeit.c

@@ -244,7 +244,7 @@ static int execute_target_process(char * const argv[]) {
    * do this, because later on we might want to kill pid _and_ all processes
    * spawned by it and its descendants.
    */
-  setpgrp();
+  setpgid(0, 0);
 
   /* Redirect the standard input, if requested. */
   if (g_target_redirect_input) {