Merge branch 'next'

* next:
  chore, use good old SXE_LANG_WERROR to turn off -Werror handling after initial compiler checks
  Revert "chore, turn off -Werror before checking mex header files"
  chore, conditionalise on strptime for man generation
  minor, adapt gentexi.sh to cope with non-existing binaries and generate dummies instead
  chore, turn off -Werror before checking mex header files