[patch] KLocale: minor optimization + use safer qgetenv

[Jarosław Staniek]

For review.
- Minor optimization: before we've typically iterated twice (in 
initLanguageList() and setLanguage() over lost of (typically) empty strings.
- Use safer qgetenv, based on getenv_s under msvc>=2k5 and just ::getenv 
elsewhere.

I shall also propose more changes to qgetenv (and qputenv), especially in 
places where we cast to QByteArray or QString.

-- 
regards / pozdrawiam, Jaroslaw Staniek
  Sponsored by OpenOffice Polska (http://www.openoffice.com.pl/en) to work on
  Kexi & KOffice (http://www.kexi.pl/en, http://www.koffice.org/kexi)
  KDE Libraries for MS Windows (http://windows.kde.org)
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