(backport)Fix #10154 and #10090: locale normalizes the UTF-8 encoding to "UTF-8" instead of "UTF8"
On MacOSX and OpenBSD (and possibly other BSDs) "en_US.UTF-8" is a valid locale
while "en_US.UTF8" is not. As the former works on Linux as well it is better
to normalize to that value.
diff --git a/Lib/locale.py b/Lib/locale.py
index 921f4f6..bb4aa37 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -621,7 +621,7 @@
'tactis': 'TACTIS',
'euc_jp': 'eucJP',
'euc_kr': 'eucKR',
- 'utf_8': 'UTF8',
+ 'utf_8': 'UTF-8',
'koi8_r': 'KOI8-R',
'koi8_u': 'KOI8-U',
# XXX This list is still incomplete. If you know more