proc/gdbserial: do not run rr when perf_event_paranoid > 1
On newer kernels when /proc/sys/kernel/perf_event_paranoid is > 1 rr will crash with SIGABRT. Return an error instead of letting this happen.
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On newer kernels when /proc/sys/kernel/perf_event_paranoid is > 1 rr will crash with SIGABRT. Return an error instead of letting this happen.