[autofit] Add support for N'Ko script. * src/autofit/afblue.dat: Add blue zone data for N'Ko. * src/autofit/afblue.c, src/autofit/afblue.h: Regenerated. * src/autofit/afscript.h: Add N'Ko standard characters. * src/autofit/afranges.c, src/autofit/afstyles.h: Add N'Ko data.