[kaffe] Updating slib.h

[Guilhem Lavaux]

Hi,

I'm proposing to transform slib.h in a real C module (slib.c, slib.h) 
which we may put in config/ directories. For the moment, external is the 
only user of this file but as I plan to dynamically retrieve symbols in 
unix-pthreads I need a symbol retrieving library.

BTW, this will be needed when we'll want to change engine or gc at 
runtime...

Comments ?

Guilhem.