[patch] KLocale: minor optimization + use safer qgetenv

[Chusslove Illich]

> [: Jaroslaw Staniek :]
> - Minor optimization: before we've typically iterated twice (in
> initLanguageList() and setLanguage() over lost of (typically) empty
> strings.
> [...]
> +static inline void getLanguagesFromVariable(QStringList& list, char* variable)

I don't think the optimization is worth it by itself, as in setLanguage the
empty strings are eliminated up front. But I do like that the variable
parsing (QFile::decodeName(...).split(':')) becomes centralized; I would
only call the function appendLanguagesFromVariable.

-- 
Chusslove Illich (Часлав Илић)
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