[BUG] perf: does not compile on ARM because of Intel PT code

[Stephane Eranian]

Hi,

If you compile tip.git on ARM32 (or ARM64, I bet) you compile link time errors:

libperf.a(libperf-in.o): In function `intel_pt_synth_branch_sample':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:899: undefined
reference to `tsc_to_perf_time'
libperf.a(libperf-in.o): In function `intel_pt_synth_transaction_sample':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:992: undefined
reference to `tsc_to_perf_time'
libperf.a(libperf-in.o): In function `intel_pt_synth_instruction_sample':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:943: undefined
reference to `tsc_to_perf_time'
libperf.a(libperf-in.o): In function `intel_pt_process_event':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:1484: undefined
reference to `perf_time_to_tsc'
libperf.a(libperf-in.o): In function `intel_pt_process_itrace_start':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:1455: undefined
reference to `perf_time_to_tsc'
libperf.a(libperf-in.o): In function `intel_pt_process_switch':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:1405: undefined
reference to `perf_time_to_tsc'
/home/ubuntu/perfmon/linux/tools/perf/util/intel-pt.c:1427: undefined
reference to `perf_time_to_tsc'
libperf.a(libperf-in.o): In function `intel_bts_process_event':
/home/ubuntu/perfmon/linux/tools/perf/util/intel-bts.c:614: undefined
reference to `perf_time_to_tsc'

That's because if AUXTRACE is detected, it pulls in x86 specific stuff
like intel-pt. This should
be decoupled.
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