fix(_comp_expand_glob): set LC_COLLATE for the sorting order

In sourcing the file `000_bash_completion_compat.bash` located in
/etc/bash_completion.d, we rely on the sorting order of the pathname
expansions.  However, this can be broken by locales that collates
digits after the alphabets.  We set LC_COLLATE to C and unset LC_ALL
(which might override LC_COLLATE) while keeping LC_CTYPE.

bash_completion

@@ -350,6 +350,10 @@ _comp_expand_glob()
     # result of pathname expansions.
     local GLOBIGNORE="" GLOBSORT=name
 
+    # To canonicalize the sorting order of the generated paths, we set
+    # LC_COLLATE=C and unset LC_ALL while preserving LC_CTYPE.
+    local LC_COLLATE=C LC_CTYPE=${LC_ALL:-${LC_CTYPE:-${LANG-}}} LC_ALL=
+
     eval -- "$1=()" # a fallback in case that the next line fails.
     eval -- "$1=($2)"