Fix #2421, adjust dependencies on table lib

[jphickey]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
Instead of having the intermediate table library build as part of the "all" target, attach it as a dependency under the custom rule. This way it will only be built in the context of the cfetables top level target, not both.

Fixes #2421

Testing performed
Build a configuration with lots of tables (> 100) repeatedly from a clean start using various -j values.

Expected behavior changes
Builds succeed, no race conditions/sporadic failures.

System(s) tested on
Debian

Additional context
This excludes the intermediate library from the all target and instead attaches it explicitly under the generate tables rule. So it should avoid the case of having two legs of a parallel build both finding the dependency and attempting to build it.

Contributor Info - All information REQUIRED for consideration of pull request
Joseph Hickey, Vantage Systems, Inc.