patch 9.0.0870: get E967 when using text property in quickfix window

Problem:    Get E967 when using text property in quickfix window. (Sergey
            Vlasov)
Solution:   Do not add an extra NUL and compute the text length correctly.
            (closes #11513)
diff --git a/src/version.c b/src/version.c
index 10aa6de..73c106e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    870,
+/**/
     869,
 /**/
     868,