v1.11.0-test.7: packpack: fix offending openpgm-5.2.pc include line for CMake

With the offending path, CMake complains about it with:

"
    CMake Error in examples/CMakeLists.txt:
      Imported target "PkgConfig::PC_libzmq" includes non-existent path

        "/usr/lib64/pgm-5.2/include"

      in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

      * The path was deleted, renamed, or moved to another location.

      * An install or uninstall procedure did not complete successfully.

      * The installation package was faulty and references files it does not
      provide.
"