workaround glibc ld.so bug #12561

from Jochen Leopold:

Fixed dclose problems (stuck in level 4)
* UNIQUE symbols in jk2gamex86.so don't allow to unload the library on map changes!
** so all global variables are not reseted -> this causes many bugs (stuck on start of level 4 for example)
* removed one "inline" attribute which fixes this bug
** there is just a GLIBCXX unique symbol left: readelf -Ws ./jk2gamex86.so | grep UNIQUE