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/coreutils/chroot.c b/coreutils/chroot.c
index 5645d72..78751df 100644
--- a/coreutils/chroot.c
+++ b/coreutils/chroot.c
@@ -13,7 +13,7 @@
 //config:	chroot is used to change the root directory and run a command.
 //config:	The default command is '/bin/sh'.
 
-//applet:IF_CHROOT(APPLET(chroot, BB_DIR_USR_SBIN, BB_SUID_DROP))
+//applet:IF_CHROOT(APPLET_NOEXEC(chroot, chroot, BB_DIR_USR_SBIN, BB_SUID_DROP, chroot))
 
 //kbuild:lib-$(CONFIG_CHROOT) += chroot.o
 
@@ -40,6 +40,7 @@
 	++argv;
 	if (!*argv)
 		bb_show_usage();
+
 	xchroot(*argv);
 
 	++argv;
diff --git a/coreutils/nice.c b/coreutils/nice.c
index 0bf0552..d6818cf 100644
--- a/coreutils/nice.c
+++ b/coreutils/nice.c
@@ -12,7 +12,7 @@
 //config:	help
 //config:	nice runs a program with modified scheduling priority.
 
-//applet:IF_NICE(APPLET(nice, BB_DIR_BIN, BB_SUID_DROP))
+//applet:IF_NICE(APPLET_NOEXEC(nice, nice, BB_DIR_BIN, BB_SUID_DROP, nice))
 
 //kbuild:lib-$(CONFIG_NICE) += nice.o
 
diff --git a/coreutils/nohup.c b/coreutils/nohup.c
index df271c7..8a70ec4 100644
--- a/coreutils/nohup.c
+++ b/coreutils/nohup.c
@@ -15,7 +15,7 @@
 //config:	help
 //config:	run a command immune to hangups, with output to a non-tty.
 
-//applet:IF_NOHUP(APPLET(nohup, BB_DIR_USR_BIN, BB_SUID_DROP))
+//applet:IF_NOHUP(APPLET_NOEXEC(nohup, nohup, BB_DIR_USR_BIN, BB_SUID_DROP, nohup))
 
 //kbuild:lib-$(CONFIG_NOHUP) += nohup.o