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/CMakeLists.txt b/CMakeLists.txt
index 96a1c62..534ef7e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -283,8 +283,6 @@
 add_compile_flags_if_supported(-Wwrite-strings)
 add_compile_flags_if_supported(-Wundef)
 
-add_compile_flags_if_supported(-Wno-suggest-override)
-
 if (LIBCXXABI_ENABLE_WERROR)
   add_compile_flags_if_supported(-Werror)
   add_compile_flags_if_supported(-WX)