patch 8.0.0709: libvterm cannot use vsnprintf()
Problem: Libvterm cannot use vsnprintf(), it does not exist in C90.
Solution: Use vim_vsnprintf() instead.
diff --git a/src/proto.h b/src/proto.h
index 729fea3..b5a6224 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -127,7 +127,8 @@
# endif
vim_snprintf(char *, size_t, char *, ...);
-int vim_vsnprintf(char *str, size_t str_m, char *fmt, va_list ap, typval_T *tvs);
+int vim_vsnprintf(char *str, size_t str_m, char *fmt, va_list ap);
+int vim_vsnprintf_typval(char *str, size_t str_m, char *fmt, va_list ap, typval_T *tvs);
# include "message.pro"
# include "misc1.pro"