__unicode_length__: New function to get number of Unicode code points (bug #50855). * libinterp/corefcn/strfns.cc (F__unicode_length__): Add new function that returns the number of Unicode code points in a UTF-8 encoded character array or cell string. * liboctave/wrappers/unistr-wrappers.c, unistr-wrappers.h (octave_u8_mbsnlen_wrapper): Add wrapper for u8_mbsnlen. * bootstrap.conf: Add unistr/u8-mbslen to list of used gnulib modules.

--- a/bootstrap.conf	Fri Jun 25 15:39:48 2021 -0400
+++ b/bootstrap.conf	Fri Apr 30 20:43:30 2021 +0200
@@ -123,6 +123,7 @@
   unistr/u16-to-u8
   unistr/u32-to-u8
   unistr/u8-check
+  unistr/u8-mbsnlen
   unistr/u8-strmblen
   unistr/u8-strmbtouc
   unistr/u8-to-u16