patch 9.0.1077: can add text property with negative ID before virtual text

Problem:    Can add text property with negative ID before virtual text
            property.
Solution:   Remember that a text property with a negative ID was used and give
            an appropriate error message. (closes #11725)
            Fix index computation.
diff --git a/src/version.c b/src/version.c
index f1a34b5..a2b4e7e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1077,
+/**/
     1076,
 /**/
     1075,