Atlas thunk bx elf pic detection

...d on ebx).  this delta simply identifies the "getEbx" function, identifies the base that ebx should point to generically, and sets that in workspace metadata variable "PIE_ebx".  each time a 32-bit PIE binary wants to access relative offset data, it calls this "getEbx" function, which returns 
rather than check it over and over, lets have the module loading code above also call vw.addVaSet once so we can assume it's present