Minor updates/fixes for latest versions of external code

[jphickey]

Corrects some minor issues found when building with the newer versions of CFE and Python

• OSAL symbol NUM_TABLE_ENTRIES replaced with OS_MAX_FILE_SYSTEMS
• _PyObject_GC_UNTRACK macro deprecated in Python 3.8
• Avoid compiler warning about "const" literal.
• Correct linking issue with EdsLib python module