patch 8.1.0549: netbeans test depends on README.txt contents

Problem:    Netbeans test depends on README.txt contents.
Solution:   Use a generated file instead.
diff --git a/src/version.c b/src/version.c
index 3d4fa68..1fb70f8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    549,
+/**/
     548,
 /**/
     547,