[xml] Access Violation when using TLS

[<oliverst online de>]

I had problems with a native threads libxml2 (after the DLL I used the
libxml2 in was removed from memory, the process, that called the DLL got
Access Violations), so I tried the TLS compiled one and I didn't ran
into those problems anymore. But now it crashes with an Access Violation
in threads.c:381 in the function xmlGetGlobalState() after being called
from globals.c:73, the initial call was xmlParseMemory(). 
Did anyone happen to have a similar problem? I am using the libxml2
2.5.11. Haven't tried it with 2.6.0beta6 yet...