external: igt-gpu-tools: support to compile with c++ am: 81e031fb15

Original change: https://android-review.googlesource.com/c/platform/external/igt-gpu-tools/+/3220275

Change-Id: I9cf7a377e0bfd1b45f831e863c0cb3e0884235e6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>