Disable -Wsuggest-override for all remaining unittests/ directories

GitOrigin-RevId: 21c0b4c1e8d6a171899b31d072a47dac27258fc5
diff --git a/acxxel/CMakeLists.txt b/acxxel/CMakeLists.txt
index 547dd62..f2ebe48 100644
--- a/acxxel/CMakeLists.txt
+++ b/acxxel/CMakeLists.txt
@@ -36,6 +36,9 @@
 
 # Add warning flags.
 set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wall -Wextra")
+if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)
+  add_definitions("-Wno-suggest-override")
+endif()
 
 add_library(
     acxxel