unconditially add suppressing flag

CMakeLists.txt

@@ -115,6 +115,7 @@ else()
     list(APPEND LUAU_OPTIONS -Wimplicit-fallthrough)
     list(APPEND LUAU_OPTIONS -Wsign-compare) # This looks to be included in -Wall for GCC but not clang
     list(APPEND LUAU_OPTIONS -Wno-maybe-uninitialized)
+
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
@@ -124,8 +125,9 @@ endif()
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     # Some gcc versions treat var in `if (type var = val)` as unused
     # Some gcc versions treat variables used in constexpr if blocks as unused
-    # list(APPEND LUAU_OPTIONS -Wno-unused)
+    list(APPEND LUAU_OPTIONS -Wno-unused)
     # GCC has some bugs where we optional<string> is treated as uninitialized if it is on a structg
+
 endif()
 
 # Enabled in CI; we should be warning free on our main compiler versions but don't guarantee being warning free everywhere