Merge branch 'api_const' of https://github.com/ignatenkobrain/util-linux

* 'api_const' of https://github.com/ignatenkobrain/util-linux:
  libsmartcols: use const qualifier where it's possible
  debug: use const void * for ul_debugobj()
  libsmartcols: make get_line/column_separator() return const

diff --cc libsmartcols/src/table.c
Simple merge