Adjusted EPOCROOT handling so that in the context of Raptor invocation,
it also updates the environment variable so that other modules (such as
e32variant.pm) can also work without changes.
EXPORTS
Init13 @ 1 NONAME
ChkC13 @ 2 NONAME
BlkI13 @ 3 NONAME
GetGeneration @ 4 NONAME
RBlkI13 @ 5 NONAME
SetCloseLib @ 6 NONAME