Unused variables

[wonder-sk]

QGIS builds everything including untwine with -Wunused-variable and -Wunused-parameter compiler flags which raise the following warnings in untwine code:

[5/17] Building CXX object src/providers/pdal/CMakeFiles/untwine.dir/__/__/__/external/untwine/bu/Processor.cpp.o
../external/untwine/bu/Processor.cpp: In member function ‘bool untwine::bu::Processor::acceptable(int, untwine::GridKey)’:
../external/untwine/bu/Processor.cpp:139:32: warning: unused parameter ‘pointId’ [-Wunused-parameter]
  139 | bool Processor::acceptable(int pointId, GridKey key)
      |                            ~~~~^~~~~~~
[11/17] Building CXX object src/providers/pdal/CMakeFiles/untwine.dir/__/__/__/external/untwine/epf/Epf.cpp.o
../external/untwine/epf/Epf.cpp: In member function ‘void untwine::epf::Epf::run(const untwine::Options&, untwine::ProgressWriter&)’:
../external/untwine/epf/Epf.cpp:76:12: warning: unused variable ‘millionPoints’ [-Wunused-variable]
   76 |     double millionPoints = 0;
      |            ^~~~~~~~~~~~~
[12/17] Building CXX object src/providers/pdal/CMakeFiles/untwine.dir/__/__/__/external/untwine/epf/Grid.cpp.o
../external/untwine/epf/Grid.cpp: In member function ‘int untwine::epf::Grid::calcLevel()’:
../external/untwine/epf/Grid.cpp:45:12: warning: unused variable ‘limit’ [-Wunused-variable]
   45 |     double limit = (MaxPointsPerNode / 1000000.0);
      |            ^~~~~

[abellgithub]

Fixed with 154e7f7