Allow BusyBox to be invoked as "<something>-busybox". This is
necessary when it's run from the Nix store as <hash>-busybox during
stdenv bootstrap.
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -947,7 +947,7 @@ void FAST_FUNC run_applet_no_and_exit(int applet_no, const char *name, char **ar
 static NORETURN void run_applet_and_exit(const char *name, char **argv)
 {
 #  if ENABLE_BUSYBOX
-	if (is_prefixed_with(name, "busybox"))
+	if (strstr(name, "busybox") != 0)
 		exit(busybox_main(/*unused:*/ 0, argv));
 #  endif
 #  if NUM_APPLETS > 0
@@ -1045,7 +1045,7 @@ int main(int argc UNUSED_PARAM, char **argv)

 	lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
 # if !ENABLE_BUSYBOX
-	if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox"))
+	if (argv[1] && strstr(bb_basename(argv[0]), "busybox") != 0)
 		argv++;
 # endif
 	applet_name = argv[0];