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.

src/version.c

@@ -783,6 +783,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    898,
 /**/
     897,
 /**/