updated for version 7.4.506
Problem:    MS-Windows: Cannot open a file with 259 characters.
Solution:   Fix off-by-one error. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 178a784..deaa7b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    506,
+/**/
     505,
 /**/
     504,