fix for avr-libc-2.0.0/include/util/eu_dst.h

[pjw]

Dear All,

I think I have fixed a bug in avr-libc-2.0.0include/util/eu_dst.h where 
the summer time was being imposed after summer time had finished, and 
vice-versa.

To decipher the code:-
    if (month == MARCH) {
        if (final_sunday < today)
            return 0; /* should be ONE_HOUR */
        if (final_sunday > today)
            return ONE_HOUR; /* should be 0 */
        ....
    }
     /* OCTOBER */
     if (final_sunday < today)
          return ONE_HOUR; /* should be 0 */
     if (final_sunday > today)
          return 0; /* should be ONE_HOUR */
     ...

Cheers,
Peter Welch.
diff -ur old/eu_dst.h new/eu_dst.h
--- old/eu_dst.h	2024-10-30 12:37:50.832265251 +0000
+++ new/eu_dst.h	2024-10-30 12:39:19.785250920 +0000
@@ -92,17 +92,17 @@
 
         if              (month == MARCH) {
             if (d < mday)
-                return 0;
-            if (d > mday)
                 return ONE_HOUR;
+            if (d > mday)
+                return 0;
             if (hour < 2)
                 return 0;
             return ONE_HOUR;
         }
         if              (d < mday)
-                            return ONE_HOUR;
-        if              (d > mday)
                             return 0;
+        if              (d > mday)
+                            return ONE_HOUR;
         if              (hour < 2)
                             return ONE_HOUR;
                         return 0;