builtins directory causes name conflict on Python 3

builtins directory causes name conflict on Python 3
https://bugs.webkit.org/show_bug.cgi?id=189552

Patch by Mike Gorse <mgorse@suse.com> on 2018-09-14
Reviewed by Michael Catanzaro.

Source/JavaScriptCore:

* CMakeLists.txt: builtins -> wkbuiltins.
* DerivedSources.make: builtins -> wkbuiltins.
* Scripts/generate-js-builtins.py: import wkbuiltins, rather than
  builtins.
* Scripts/wkbuiltins/__init__.py: Renamed from Source/JavaScriptCore/Scripts/builtins/__init__.py.
* Scripts/wkbuiltins/builtins_generate_combined_header.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_combined_header.py.
* Scripts/wkbuiltins/builtins_generate_internals_wrapper_implementation.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_internals_wrapper_implementation.py.
* Scripts/wkbuiltins/builtins_generate_separate_header.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_separate_header.py.
* Scripts/wkbuiltins/builtins_generate_separate_implementation.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_separate_implementation.py.
* Scripts/wkbuiltins/builtins_generate_wrapper_header.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_wrapper_header.py.
* Scripts/wkbuiltins/builtins_generate_wrapper_implementation.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generate_wrapper_implementation.py.
* Scripts/wkbuiltins/builtins_generator.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_generator.py.
* Scripts/wkbuiltins/builtins_model.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_model.py.
* Scripts/wkbuiltins/builtins_templates.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins_templates.py.
* Scripts/wkbuiltins/wkbuiltins.py: Renamed from Source/JavaScriptCore/Scripts/builtins/builtins.py.
* JavaScriptCore.xcodeproj/project.pbxproj: Update for the renaming.

Source/WebCore:

No new tests (No behavior change).

* CMakeLists.txt: builtins -> wkbuiltins.
* DerivedSources.make: builtins -> wkbuiltins.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@236005 268f45cc-cd09-0410-ab3c-d52691b4dbfc