Revert "Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories."

This reverts commit 388c9fb1af48b059d8b65cb2e002e0992d147aa5.

GitOrigin-RevId: 97a0f80c469c338e9173355e9f8a0a977adfe266
diff --git a/acxxel/CMakeLists.txt b/acxxel/CMakeLists.txt
index 6391c73..7e71446 100644
--- a/acxxel/CMakeLists.txt
+++ b/acxxel/CMakeLists.txt
@@ -36,9 +36,6 @@
 
 # Add warning flags.
 set(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -Wall -Wextra")
-if (CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG)
-    add_compile_options("-Wno-suggest-override")
-endif()
 
 add_library(
     acxxel