File gcal-gcc15.patch of Package gcal

--- gcal-4.1.orig/src/hd-defs.h	2025-06-10 09:37:26.469215242 +0000
+++ gcal-4.1/src/hd-defs.h	2025-06-10 09:42:44.522116166 +0000
@@ -677,7 +677,7 @@ typedef struct country_code_type
   char *cc_info;
 
   /* The country code specific holiday handling function. */
-  void (*Cc_hdy_handler) ();
+  void (*Cc_hdy_handler) (Bool *, const Bool,  int,  const int,  int *, const int,  const int);
 }
 Cc_struct;