fix: Add back remove warning as error

cmat/CMakeLists.txt

@@ -18,11 +18,11 @@
 # Legacy course material: keep the project's warning flags but drop -Werror;
 # these old sources produce warnings that must not block the build.
 set(CMAT_OPTIONS "")
-# foreach (opt IN LISTS BASE_OPTIONS)
-#     if (NOT opt STREQUAL "-Werror" AND NOT opt STREQUAL "/WX")
-#         list(APPEND CMAT_OPTIONS "${opt}")
-#     endif()
-# endforeach()
+foreach (opt IN LISTS BASE_OPTIONS)
+    if (NOT opt STREQUAL "-Werror" AND NOT opt STREQUAL "/WX")
+        list(APPEND CMAT_OPTIONS "${opt}")
+    endif()
+endforeach()
 
 # ------------------------------------------------------------------------------
 # Keyboard/Screen support (DOS_Unix/)