NOMMU re-exec trick shuld not depend on existence of "don't daemonize"

option for every affected applet (and dnsd, for example, don't have one).
Thus rework re-exec support to not require it. Code got smaller too.

applets/busybox.c

@@ -7,6 +7,7 @@
 #include "busybox.h"
 
 const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
+smallint re_execed;
 
 #ifdef CONFIG_FEATURE_INSTALLER
 /*
@@ -59,6 +60,12 @@ int main(int argc, char **argv)
 {
 	const char *s;
 
+	/* NOMMU re-exec trick sets high-order bit in first byte of name */
+	if (argv[0][0] & 0x80) {
+		re_execed = 1;
+		argv[0][0] &= 0x7f;
+	}
+
 	applet_name = argv[0];
 	if (*applet_name == '-')
 		applet_name++;

applets/individual.c

@@ -9,12 +9,11 @@ const char *applet_name;
 
 #include <stdio.h>
 #include <stdlib.h>
-//Ok to remove? #include "bb_config.h"
 #include "usage.h"
 
 int main(int argc, char *argv[])
 {
-	applet_name=argv[0];
+	applet_name = argv[0];
 
 	return APPLET_main(argc,argv);
 }