gyp: list(dict) so we can del dict(key) while iterating

cclauss · rvagg · commit 103740cd957a · 2020-02-03T14:43:39.000+11:00
Fixes #1998 Reviewed-By: Rod Vagg <rod@vagg.org> PR-URL: #2009
diff --git a/gyp/pylib/gyp/input.py b/gyp/pylib/gyp/input.py
@@ -2286,7 +2286,7 @@ def SetUpConfigurations(target, target_dict):
         merged_configurations[configuration])
 
   # Now drop all the abstract ones.
-  for configuration in target_dict['configurations'].keys():
+  for configuration in list(target_dict['configurations']):
     old_configuration_dict = target_dict['configurations'][configuration]
     if old_configuration_dict.get('abstract'):
       del target_dict['configurations'][configuration]
