make prelink a module variable
Added prelink support to the disassembler

Now the dynamic tracing with the stacktracer can run on
redhat based system. Basically before disassembling an elf
file I need to undo the prelinking.

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>
some more comment on undoing the prelink

Signed-off-by: Luca Clementi <luca.clementi@gmail.com>