updated for version 7.3.555
Problem:    Building on IBM z/OS fails.
Solution:   Adjust configure. Use the QUOTESED value from config.mk instead of
            the hard coded one in Makefile. (Stephen Bovy)
diff --git a/src/version.c b/src/version.c
index 9ef28d4..d3bb184 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    555,
+/**/
     554,
 /**/
     553,