updated for version 7.4.055

Problem:    Mac: Where availability macros are defined depends on the system.
Solution:   Add a configure check. (Felix Bünemann)

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    55,
 /**/
     54,
 /**/