an example/modify_pltgot_entry tool

[elfmaster]

Please write a libelfmaster program that allows you to overwrite a specific .got.plt entry with a uintptr_t sized address. This address will either point into an absolute address range of a shared library due to prelinking, or it should point to some parasitic code within the binary itself, i.e. within a padding infection of some type.

The purpose of this tool is to essentially compliment the https://github.com/elfmaster/dt_infect program when it is using DT_DEBUG overwrite mode which does not create an automatic symbol hijacking since there is no interposition.