Fix library path to refer ./mach_star/ rather than ../mach_override/
Build 64-bit by default for 10.7 and up
Delay locating Finder process up to 5 seconds before injection

When installed as a LuanchAngent, injector could run before Finder is up.
If so, resulting pid will be 0, leaving the actual injection not performed.
As a remedy, limited delay checks are applied to ensure that Finder pid is
correctly located.