Little modification of the makefile.
Little modification of the makefile.

I made the paths relative to the PIN_ROOT variable.
It allows us to do build the tool without being in pin-*/source/tools.
Nevertheless, it's default value is the same as before "../../..".

JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton