Adjust build_and_check_manifest.py

Give a warning for platforms that are known now to support all builtins

admin-tools/build_and_check_manifest.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 
-from mathics.builtin.system_init import name_is_builtin_symbol, modules, Builtin
+from mathics.builtin import modules
+from mathics.builtin.base import Builtin
+from mathics.core.system_init import name_is_builtin_symbol
 import sys
 
 
@@ -78,5 +80,13 @@ def check_manifest():
         if sys.argv[1] == "--rebuild":
             build_builtin_manifest()
     elif len(sys.argv) == 1:
+        if sys.platform == "win32" or hasattr(sys, "pyston_version_info"):
+            if sys.platform == "win32":
+                print(
+                    f"Note: this platform {sys.platform} is known not to support all builtins."
+                )
+            else:
+                print("Note: pyston is knowns not not to contain all builtins.")
+
         check_manifest()
         print("The manifest is consistent with the implemented builtins.")