[PATCH] Fix cpu detection in iostat applet for ARM

[Gustavo Zacarias]

The new iostat applet tries to count CPUs via /proc/cpuinfo checking for
"Processor\t:".
Some architectures like ARM use "processor\t:".
We should really be using something like get_cpu_nr() from the mpstat
applet that parses /proc/stat instead since SPARC uses yet another
convention that won't work with this either.

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