perf tools: Replace mempcpy with memcpy

mempcpy is not supported by bionic in Android and will lead to
compilation errors.

Replacing mempcpy with memcpy so it will work in Android.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/CANg8OW+Y3ZMG-GdhYu2_yKOYH_XEMgw73PdCX_23UTnfYhmttA@mail.gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/target.c

@@ -117,8 +117,8 @@ int perf_target__strerror(struct perf_target *target, int errnum,
 
 		if (err != buf) {
 			size_t len = strlen(err);
-			char *c = mempcpy(buf, err, min(buflen - 1, len));
-			*c = '\0';
+			memcpy(buf, err, min(buflen - 1, len));
+			*(buf + min(buflen - 1, len)) = '\0';
 		}
 
 		return 0;