patch 8.1.0898: a messed up rgb.txt can crash Vim

Problem:    A messed up rgb.txt can crash Vim. (Pavel Cheremushkin)
Solution:   Limit to 10000 entries.  Also don't retry many times when the file
            cannot be read.
diff --git a/src/version.c b/src/version.c
index 6e3d780..a2c250e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    898,
+/**/
     897,
 /**/
     896,