deps_builder: harden the package download process

During the 3.3 release some packages were missing
in SVN during the release and it ended up building
the release tarball without issues when re-running
the `make source_archive_complete` command after it
failed initially. The tarball however had 0 byte files
for the missing packages.... not good.

This diff hardens the download process by :

1) Validating all required variables are set. This
catches the erroneously attempt at downloading the
nanovdb package even though we have removed it
from versions.cmake but neglected to remove it
from download.cmake

2) When a download fails (due to either a missing
package, or bad download URL) FILE Download will
warn about a hash mismatch but will carry on
happily, you then have to go into the file system
go delete the 0 byte file to retry the download.
We know for a fact the file is bad when it is 0
bytes, just delete it.

3) When we are using the blender repository
(and likely building a source archive) explicitly
validate the hash of all packages. Normally the
build process does this, however when building
a source archive the build does not actually
run for a dep. So preform this check during the
configuration stage.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D16124

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