(merge) 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.

Lib/locale.py

@@ -643,7 +643,7 @@ locale_encoding_alias = {
     '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

Misc/NEWS

@@ -698,6 +698,9 @@ Library
   and a non-zero offset, and an attempt to read past the end of file is made
   (IndexError is raised instead).  Patch by Ross Lagerwall.
 
+- Issue #10154, #10090: change the normalization of UTF-8 to "UTF-8" instead
+  of "UTF8" in the locale module as the latter is not supported MacOSX and OpenBSD.
+
 - Issue #10684: shutil.move used to delete a folder on case insensitive
   filesystems when the source and destination name where the same except
   for the case.