make 17 state-changing execing applets (ex: "nice PROG ARGS") noexec

The applets with "<applet> [opts] PROG ARGS" API very quickly exec
another program, noexec is okay for them:

 chpst/envdir/envuidgid/softlimit/setuidgid
 chroot
 chrt
 ionice
 nice
 nohup
 setarch/linux32/linux64
 taskset
 cttyhack

"reset" and "sulogin" applets don't have this form, but also exec
another program at once, thus made noexec too.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/ionice.c b/util-linux/ionice.c
index c7b7f03..5b9664d 100644
--- a/util-linux/ionice.c
+++ b/util-linux/ionice.c
@@ -14,7 +14,7 @@
 //config:	Set/set program io scheduling class and priority
 //config:	Requires kernel >= 2.6.13
 
-//applet:IF_IONICE(APPLET(ionice, BB_DIR_BIN, BB_SUID_DROP))
+//applet:IF_IONICE(APPLET_NOEXEC(ionice, ionice, BB_DIR_BIN, BB_SUID_DROP, ionice))
 
 //kbuild:lib-$(CONFIG_IONICE) += ionice.o