[Bug 57540] New: unrecognized charset 'SHIFT_JIS' when running Wine with LC_ALL=ja_JP.SJIS

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57540

Bug ID: 57540
           Summary: unrecognized charset 'SHIFT_JIS' when running Wine
                    with LC_ALL=ja_JP.SJIS
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Some older visual novels require using the Japanese Shift JIS locale, which has
to be generated via `localedef` (at least on Linux Mint and Artix Linux).
I generated mine as such (following this[0] Wine forum post):
```
localedef -c -f SHIFT_JIS -i ja_JP ja_JP.SJIS
```

But when running the game's installer (after logging out and in for the changes
to take effect), Wine gives an unrecognized charset error:
```
$ LC_ALL="ja_JP.SJIS" wine ./Setup.exe
err:environ:init_unix_codepage unrecognized charset 'SHIFT_JIS'
```

This is because in dlls/ntdll/unix/env.c, the `charset_names` array's entry for
Shift JIS is wrong.

As can be seen in the command, and in $I18NPATH/charmaps
(/usr/share/i18n/charmaps on my system), The gzip-compressed character map file
is called `SHIFT_JIS.gz` instead of `SJIS.gz`.

This is solved by changing the `name` from "SJIS" to "SHIFTJIS" in the array
element.

Tested on 448fcbc0c60d7228ed52f1f5d90f62be0a58289a

[0]:
https://forum.winehq.org/viewtopic.php?p=110966&sid=e1b934de7663eedec41e...