trace-cmd: Use sysconf to figure out # of CPUs
trace-cmd: Use sysconf to figure out # of CPUs

Use the POSIX  sysconf instead of the hack to figure out the number of
CPUs the current machine has.

Suggested-by: Russell King <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd