[Rd] R CMD INSTALL doesn't always clean up (PR#7230)

[vangyzen at stat.duke.edu]

Full_Name: Eric van Gyzen
Version: 1.9.1
OS: FreeBSD
Submission from: (NULL) (152.3.22.120)


In several cases, "R CMD INSTALL" doesn't remove its temporary directory.  It
should call "do_cleanup" before every "exit".