[libc++] Print the CMake version before generating CMake

GitOrigin-RevId: e93c95dea103ead27c522a41085949bd73a30d9a
diff --git a/utils/ci/run-buildbot b/utils/ci/run-buildbot
index fcdc125..ebd0c46 100755
--- a/utils/ci/run-buildbot
+++ b/utils/ci/run-buildbot
@@ -112,6 +112,10 @@
     ${NINJA} -vC "${BUILD_DIR}" check-cxx-benchmarks
 }
 
+# Print the version of a few tools to aid diagnostics in some cases
+cmake --version
+${NINJA} --version
+
 case "${BUILDER}" in
 check-format)
     clean