Don't use [.lib.pods] staging directory in VMS builds.

Don't use [.lib.pods] staging directory in VMS builds.

It's arduous to maintain all the dependency rules, and since
7eb47696de, which removed the only reference to $(pod), we don't
even *run* any of those rules, i.e., the directory does not even
get populated during the build.  Its existence appears to be a
carryover from a time before installperl copied [.pods] in the
build directory to [.lib.pods] in the install directory.

Reducing the size of vms/descrip_mms.template by 44% probably
won't cause too many tears to be shed, either.