--enable-all-extensions tries to enable ICU if the sdk is available. pypi builds currently don't detect icu so it isn't included. If it was detected it wouldn't work on deployment because of binary and abi issues.
[x] Explicitly disable ICU for pypi builds
[x] Document that
[ ] Update setup.py to use subprocess not os.popen to run icu/pkg-config to avoid running process warnings in debug
--enable-all-extensions
tries to enable ICU if the sdk is available. pypi builds currently don't detect icu so it isn't included. If it was detected it wouldn't work on deployment because of binary and abi issues.