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.
--- busybox-1.26.1-orig/libbb/appletlib.orig	2016-10-26 19:54:20.510957575 -0400
+++ busybox-1.26.1/libbb/appletlib.c	2016-10-26 19:48:31.590862853 -0400
@@ -887,7 +887,7 @@
 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(argv));
 #  endif
 #  if NUM_APPLETS > 0
@@ -981,7 +981,7 @@ 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];