patch 9.0.1378: illegal memory access when using virtual editing

Problem:    Illegal memory access when using virtual editing.
Solution:   Make sure "startspaces" is not negative.
diff --git a/src/version.c b/src/version.c
index a9cf30e..c93499c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1378,
+/**/
     1377,
 /**/
     1376,