Note update of hbench to 1.0nb6

(chris)

Fiz mhz calculation for arm.  It seems gcc has become intelligent enough
to optimize away the loop used for timing.  Do something in the loop for
arm that can't be optimized away, and will also meet the 1,000
instructions in the loop requirement.

This allows mhz to calculate sensible Mhz on a StrongArm (228Mhz rather
than 56Mhz)

Other hardware probably also need fixing, as gcc probably applies the same
optimizations on them.

Also bump PKGREVISION.

(chris)