libmlir-15-dev, libmapnik-dev, fix llvm-15-dev transform slice

Vladimir Petkorequested to merge
vpa1977/armhf-time_t:sort-find-headers into main

Changes:

  • add sort operation in find_headers (this may fix libogre)
  • libmlir-15-dev : split into separate slices
  • llvm-15-dev: drop debug code from transforms slice
  • libmapnik-dev: exclude implementation header, add a separate slice for svg generator (symbol redefinitions)
Edited by Vladimir Petko

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