patch 8.0.1680: memory allocated by libvterm is not profiled

Problem:    Memory allocated by libvterm does not show up in profile.
Solution:   Pass allocater functions to vterm_new().
diff --git a/src/version.c b/src/version.c
index a044f09..f0a21b3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1680,
+/**/
     1679,
 /**/
     1678,