patch 8.2.0783: libvterm code lags behind the upstream version

Problem:    Libvterm code lags behind the upstream version.
Solution:   Include revisions 728 - 729.
diff --git a/src/Makefile b/src/Makefile
index 7c2934a..ad8f241 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3537,6 +3537,7 @@
 # prefix vterm_ to avoid name clashes.
 CCCTERM = $(CCC_NF) $(VTERM_CFLAGS) $(ALL_CFLAGS) -DINLINE="" \
 	  -DVSNPRINTF=vim_vsnprintf \
+	  -DSNPRINTF=vim_snprintf \
 	  -DIS_COMBINING_FUNCTION=utf_iscomposing_uint \
 	  -DWCWIDTH_FUNCTION=utf_uint2cells