variable matching code ripped out of ash shell for code sharing.

Linux Driver: ash shell port for busybox.

Adapted from ash applet code for Linux.-Adapted from ash applet code for Linux.

ash function implementation for the nontrivial specialization. All of them are based on a primitive that hashes a pointer to a byte array. -ash function implementation for the nontrivial specialization. All of them are based on a primitive that ha