Fix issue with undefined variable when cacheinit.cmake isn't used

[jhendersonHDF]

Important

Fixes undefined PL_PACKAGE_NAME issue in CMakeLists.txt by setting a default value if not defined.

• Behavior:
  • Fixes issue with undefined PL_PACKAGE_NAME in CMakeLists.txt by setting a default value "pl" if not defined.
  • Ensures BASIC_SETTINGS function receives a valid package name.

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