Build.zig: Skip copying files that are used internally by the compiler
Before this it was trying to copy all the files from the zig-cache dir
to the output dir, but in the current compiler architecture the cache
dir is also used for internal compiler files.
e94a06ac29Timon Kruiper committed on 10/5/2020, 4:31:21 AM· committed by Andrew Kelleyparentdce74c3