Display number of processors in System Info dialog.

Since Rockbox Utility got support for utilizing more than one CPU / Core
this value might be helpful in case of issues like FS#11496 (QThreadPool
defaults to the number of CPUs found as maximum number of threads).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28106 a1c6a512-1295-4272-9138-f99709370657
1 file changed