CYGPKG_CPULOAD fixes

[Lars Povlsen]

Here's a small fix to the cpuload package (and idle thread).

In short, a missing 'volatile' attribute to the loop counter causes
newer (arm-eabi GCC 4.2.3/eCosentric toolchain) to produce wrong
results.

This patch adds a volatile modifier to idle_thread_loops[], and updates
the reference to it from the cpuload package. (which was also using a
non-array declaration).

Cheers,

Lars Povlsen
Vitesse Semiconductor Corp

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