patch 8.2.0776: libvterm code lags behind the upstream version

Problem:    Libvterm code lags behind the upstream version.
Solution:   Include revision 719.
diff --git a/src/libvterm/Makefile b/src/libvterm/Makefile
index 2fca6ad..e56c10a 100644
--- a/src/libvterm/Makefile
+++ b/src/libvterm/Makefile
@@ -66,6 +66,9 @@
 src/encoding/%.inc: src/encoding/%.tbl
 	perl -CSD tbl2inc_c.pl $< >$@
 
+src/fullwidth.inc:
+	@perl find-wide-chars.pl >$@
+
 src/encoding.lo: $(INCFILES)
 
 bin/%: bin/%.c $(LIBRARY)