script: FPC reference replaced with a variable to FPC binary
script: FPC reference replaced with a variable to FPC binary

This means if we want to change the FPC binary we only need to edit
one line.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI