Test for LoadString

[Vitaly Lipatov]

Add tests for LoadString, completed on Windows.

As I see,
1. LoadStringA with buf = NULL segfaults in Windows, we have to produce ERR 
message instead
2. LoadStringA with buf = NULL, buflen = 0 returns -1
3. LoadStringW with some buf, buflen = 0 returns length of the resource string 
and puts some strange chars (F%O f.i.) in the buffer.
4. LoadStringW with buf = NULL, buflen!=0 returns 0
5. LoadStringA/W segfaults on negative buflen


Changelog:
- add tests for LoadStringA/W with zero/negative parameters
- add tests for LoadStringW

-- 
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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