kivy-ios: PIL (pillow) loading fails with pkg_resources error

Versions

• Python : 3.8
• MacOS version : 10.15.5
• XCode Version : 11.2.1
• Cython version : 0.28.1

Describe the bug When running the program, the loading fails with a missing module error dispalyed in the console.

   File "/Users/richard/Library/Developer/CoreSimulator/Devices/E5F90713-0057-4F0B-A728-F6F27038B40F/data/Containers/Bundle/Application/8522E39B-C6F1-441E-B036-71CAF7A37FCE/btp-kivy-app.app/lib/python3.8/site-packages/Pillow-6.1.0-py3.8-macosx-10.15-x86_64.egg/PIL/_imaging.py", line 3, in __bootstrap__
 ModuleNotFoundError: No module named 'pkg_resources'
2020-07-15 20:05:34.507524+0200 btp-kivy-app[47771:3173351] Application quit abnormally!

To Reproduce toolchain build pillow

Logs

[INFO   ] [Audio       ] Providers: audio_sdl2 (audio_avplayer, audio_ffpyplayer ignored)
 Traceback (most recent call last):
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/main.py", line 6, in <module>
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/controller.py", line 6, in <module>
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/lib/CPData/lifestory/game.py", line 25, in <module>
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/lib/CPData/lifestory/lsmanager.py", line 4, in <module>
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/lib/CPData/lifestory/lsicon.py", line 6, in <module>
   File "/Users/richard/Repos/btp/kivy-ios/btp-kivy-app-ios/YourApp/lib/CPData/game/exifrotation.py", line 15, in <module>
   File "<frozen zipimport>", line 259, in load_module
   File "/Users/richard/Library/Developer/CoreSimulator/Devices/E5F90713-0057-4F0B-A728-F6F27038B40F/data/Containers/Bundle/Application/8522E39B-C6F1-441E-B036-71CAF7A37FCE/btp-kivy-app.app/lib/python3.8/site-packages/Pillow-6.1.0-py3.8-macosx-10.15-x86_64.egg/PIL/Image.py", line 95, in <module>
   File "<frozen zipimport>", line 259, in load_module
   File "/Users/richard/Library/Developer/CoreSimulator/Devices/E5F90713-0057-4F0B-A728-F6F27038B40F/data/Containers/Bundle/Application/8522E39B-C6F1-441E-B036-71CAF7A37FCE/btp-kivy-app.app/lib/python3.8/site-packages/Pillow-6.1.0-py3.8-macosx-10.15-x86_64.egg/PIL/_imaging.py", line 7, in <module>
   File "/Users/richard/Library/Developer/CoreSimulator/Devices/E5F90713-0057-4F0B-A728-F6F27038B40F/data/Containers/Bundle/Application/8522E39B-C6F1-441E-B036-71CAF7A37FCE/btp-kivy-app.app/lib/python3.8/site-packages/Pillow-6.1.0-py3.8-macosx-10.15-x86_64.egg/PIL/_imaging.py", line 3, in __bootstrap__
 ModuleNotFoundError: No module named 'pkg_resources'
2020-07-15 20:05:34.507524+0200 btp-kivy-app[47771:3173351] Application quit abnormally!
2020-07-15 20:05:34.544800+0200 btp-kivy-app[47771:3173351] Leaving