Bug 769124 - Australian (GMT-10) OFX transactions imported have previous

day's date. Previous efforts didn't work on Windows and shouldn't have
elsewhere because gnc_localtime and gnc_mktime are inverse functions;
in particular gnc_mktime doesn't adjust the time based on the value
of tm_isdst, though some implementations of STDC mktime do.

Rather than being too clever about trying to find the DST offset this
implementation just uses 1 hour.

src/import-export/ofx/gnc-ofx-import.c

@@ -337,13 +337,8 @@ fix_ofx_bug_39 (time64 t)
 #if HAVE_OFX_BUG_39
     struct tm stm;
     gnc_localtime_r(&t, &stm);
-    if (!stm.tm_isdst)
-    {
-        time64 new_t;
-        stm.tm_isdst = 1;
-        new_t = gnc_mktime(&stm);
-    t += t - new_t;
-    }
+    if (daylight && !stm.tm_isdst)
+      t += 3600;
 #endif
     return t;
 }