Don't test datetime in locales with no encoding

Some datetime tests run the test in every available locale.
If this set includes locales without an encoding (currently dsb_DE
and sah_RU), it fails due to Python bug
https://bugs.python.org/issue20088

Failure log
https://tests.reproducible-builds.org/debian/rbuild/buster/amd64/pandas_0.23.3+dfsg-3.rbuild.log.gz

Author: Rebecca N. Palmer <[email protected]>
Bug: pandas-dev/pandas#20957
Forwarded: no


Gbp-Pq: Name skip_noencoding_locales.patch

Author: Debian Science Team

pandas/_config/localization.py

@@ -99,6 +99,8 @@ def _valid_locales(locales, normalize):
 
 def _default_locale_getter():
     raw_locales = subprocess.check_output(["locale -a"], shell=True)
+    # skip locales without encoding, to avoid Python bug https://bugs.python.org/issue20088
+    raw_locales = raw_locales.replace(b'\ndsb_DE\n',b'\n').replace(b'\nsah_RU\n',b'\n').replace(b'\ncrh_UA\n',b'\n')
     return raw_locales