* src/vipw.c, src/su.c, src/newgrp.c: Harmonize the children's

SIGSTOP handling. Raise the signal which stopped the child instead
	of always SIGSTOP.

	Import Debian patch 406_vipw_resume_properly.
	Thanks to Dean Gaudet.
	* NEWS, src/vipw.c: Resume properly after ^Z.

src/newgrp.c

@@ -294,7 +294,7 @@ static void syslog_sg (const char *name, const char *group)
 				pid = waitpid (child, &cst, WUNTRACED);
 				if (pid == child && WIFSTOPPED (cst)) {
 					/* stop when child stops */
-					raise (SIGSTOP);
+					kill (getpid (), WSTOPSIG(status));
 					/* wake child when resumed */
 					kill (child, SIGCONT);
 				}