Check out the tagged version of the lustre-build scripts, so we are sure
to use the same ones as when the packages were originally built.

 - print a summary of failed updates/checkouts at the end
 - also return an error status in this case

Handle "./lustrecvs -r foo" instead of choking.

complain if more than one argument was passed, so that people who do ./lustrecvs co -r foo get an error as soon as practical

 - set LC_COLLATE=C otherwise [a-z] and [A-Z] don't work how we expect
   them to

 * get rid of LC_{DARWIN,LINUX}_SUPPORTED in favor of more general
   LC_TARGET_SUPPORTED
 * fix some typos and spacings

own buildcvs scriptlet.