Fix tests/identify_stream_usage.cpp (#13066)

The identify_stream_usage test uses `strcmp` but not does not include `<cstring>`. This PR fixes that.

The missing include was surfaced by #13064, showing that the test relied on headers in `spdlog` to include `cstring`.

Authors:
  - Allard Hendriksen (https://github.com/ahendriksen)
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Nghia Truong (https://github.com/ttnghia)

URL: #13066

cpp/tests/utilities/identify_stream_usage.cpp

@@ -20,6 +20,7 @@
 #include <cuda_runtime.h>
 
 #include <cstdlib>
+#include <cstring>
 #include <cxxabi.h>
 #include <dlfcn.h>
 #include <execinfo.h>