inttypes.h -> cinttypes

In some toolchains PRIu32 and other printf formatters
work only when including cinttypes.
The reason seem to have to do with pre-C++ reasons and
__STDC_FORMAT_MACROS.

See also Notes section of https://en.cppreference.com/w/cpp/types/integer

Bug: https://github.com/google/perfetto/issues/146
Change-Id: Ia2df81271e77ffff8e412e7d003c5af70774f71e
diff --git a/tools/multithreaded_alloc.cc b/tools/multithreaded_alloc.cc
index 6125777..4c5e603 100644
--- a/tools/multithreaded_alloc.cc
+++ b/tools/multithreaded_alloc.cc
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 
 #include <atomic>
+#include <cinttypes>
 #include <condition_variable>
 #include <iterator>
 #include <mutex>