+ If you leave this disabled, busybox will use the system's
+ crypt functions. Most C libraries use large (~70k)
+ static buffers there, and also combine them with more general
+ DES encryption/decryption.
+
+ For busybox, having large static buffers is undesirable,
+ especially on NOMMU machines. Busybox also doesn't
+ need DES encryption/decryption and can do with smaller code.