Fix #2423, avoid use of abspath make function

[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
The abspath function does not work in GNU make v3.80, which is still used as it is packaged with the Wind River tools as part of VxWorks 6.x.

The $(abspath ...) function was used in two places related to generating tables - first for extraction of the ELF file from an intermediate lib, second for conversion of that ELF file to a table file. In the first case, the path should already be absolute, as it comes from CMake. In the second case, the path should always be relative, because it is intended to match another pattern rule starting with "elf/%". For the second rule, prefixing with $(CURDIR) should achieve the same effect.

Fixes #2423

Testing performed
Build with both older (v3.80) and newer (v4.3) versions of GNU make

Expected behavior changes
Successfully builds using make v3.80

System(s) tested on
GSFC Vxworks development machine

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

[jphickey]

Note this PR also adds some quoting. This should make it a bit more robust just in case a filename contains spaces. But more importantly, it makes it more evident in the console if an argument evaluated to an empty string -- that is, one can easily see the quotes with an empty string vs. no argument at all - which doesn't really look wrong.