libperf: Move zalloc.o into libperf

We need it in both perf and libperf, thus moving it to libperf.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-45-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/python-ext-sources

@@ -18,7 +18,6 @@ util/namespaces.c
 ../lib/hweight.c
 ../lib/string.c
 ../lib/vsprintf.c
-../lib/zalloc.c
 util/thread_map.c
 util/util.c
 util/xyarray.c