patch 9.0.0810: readblob() returns empty when trying to read too much

Problem:    readblob() returns empty when trying to read too much.
Solution:   Return what is available.
diff --git a/src/version.c b/src/version.c
index 94e5d5c..4017c47 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    810,
+/**/
     809,
 /**/
     808,