[Bug 1422290] [NEW] Default charsets handling for Windows archives in CJKV+th locale

[Aron Xu]

Public bug reported:

This branch adds default charsets handling for Windows archives in
CJKV+th locale, inspired by Ubuntu Kylin way.

As a result of bug #580961, two options have been added as Ubuntu patch.
> -O CHARSET specify a character encoding for DOS, Windows and OS/2 archives
> -I CHARSET specify a character encoding for UNIX and other archives

Then Ubuntu Kylin added default encoding as environment variables for their distribution.
http://bazaar.launchpad.net/~ubuntukylin-members/ubuntukylin-default-settings/trunk/revision/171

Now as Ubuntu, we can go further by a better way:
 - per user settings by their locales instead of global settings
 - don't interfere in other locales by locale guard

I only add "-O", so no behavior change for zip files created on Ubuntu
or other Linux/UNIX systems. This branch just handles zip file created
on localized Windows system seamlessly.

charsets list is taken from:
https://msdn.microsoft.com/en-us/goglobal/bb964654
and
msdos/msdos.c in unzip package:
   1682 case 932: /* Japanese */
   1683 case 949: /* Korean */
   1684 case 936: /* Chinese, simple */
   1685 case 950: /* Chinese, traditional */
   1686 case 874: /* Thai */
   1687 case 1258: /* Vietnamese */

(Copied from @nobuto's branch description.)

** Affects: unzip (Ubuntu)
     Importance: Medium
         Status: Triaged

** Branch linked: lp:~nobuto/ubuntu/vivid/unzip/fallback-encoding

** Changed in: unzip (Ubuntu)
   Importance: Undecided => Medium

** Changed in: unzip (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1422290

Title:
  Default charsets handling for Windows archives in CJKV+th locale

Status in unzip package in Ubuntu:
  Triaged

Bug description:
  This branch adds default charsets handling for Windows archives in
  CJKV+th locale, inspired by Ubuntu Kylin way.

  As a result of bug #580961, two options have been added as Ubuntu patch.
  > -O CHARSET specify a character encoding for DOS, Windows and OS/2 archives
  > -I CHARSET specify a character encoding for UNIX and other archives

  Then Ubuntu Kylin added default encoding as environment variables for their distribution.
  http://bazaar.launchpad.net/~ubuntukylin-members/ubuntukylin-default-settings/trunk/revision/171

  Now as Ubuntu, we can go further by a better way:
   - per user settings by their locales instead of global settings
   - don't interfere in other locales by locale guard

  I only add "-O", so no behavior change for zip files created on Ubuntu
  or other Linux/UNIX systems. This branch just handles zip file created
  on localized Windows system seamlessly.

  charsets list is taken from:
  https://msdn.microsoft.com/en-us/goglobal/bb964654
  and
  msdos/msdos.c in unzip package:
     1682 case 932: /* Japanese */
     1683 case 949: /* Korean */
     1684 case 936: /* Chinese, simple */
     1685 case 950: /* Chinese, traditional */
     1686 case 874: /* Thai */
     1687 case 1258: /* Vietnamese */

  (Copied from @nobuto's branch description.)

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