perf tools: Rename build libperf to perf

Rename build libperf to perf, because it's used to build perf.

The libperf build object name will be used for libperf library.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190213123246.4015-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/Build

@@ -1,18 +1,18 @@
-libperf-y += header.o
-libperf-y += tsc.o
-libperf-y += pmu.o
-libperf-y += kvm-stat.o
-libperf-y += perf_regs.o
-libperf-y += group.o
-libperf-y += machine.o
-libperf-y += event.o
+perf-y += header.o
+perf-y += tsc.o
+perf-y += pmu.o
+perf-y += kvm-stat.o
+perf-y += perf_regs.o
+perf-y += group.o
+perf-y += machine.o
+perf-y += event.o
 
-libperf-$(CONFIG_DWARF) += dwarf-regs.o
-libperf-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o
+perf-$(CONFIG_DWARF) += dwarf-regs.o
+perf-$(CONFIG_BPF_PROLOGUE) += dwarf-regs.o
 
-libperf-$(CONFIG_LOCAL_LIBUNWIND)    += unwind-libunwind.o
-libperf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
+perf-$(CONFIG_LOCAL_LIBUNWIND)    += unwind-libunwind.o
+perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
 
-libperf-$(CONFIG_AUXTRACE) += auxtrace.o
-libperf-$(CONFIG_AUXTRACE) += intel-pt.o
-libperf-$(CONFIG_AUXTRACE) += intel-bts.o
+perf-$(CONFIG_AUXTRACE) += auxtrace.o
+perf-$(CONFIG_AUXTRACE) += intel-pt.o
+perf-$(CONFIG_AUXTRACE) += intel-bts.o