oc-calendar: Fix import in SOGo exceptions from recurring series

According to [MS-OXICAL] Section 2.1.3.1.1.20.13, the EXDATE property
must be written only if there are ocurrences from the series that have
been deleted and before this commit ModifiedInstanceDates were also
included.

We check against every ExceptionInfo from exception ocurrences of the series
to know if the ocurrence was deleted or only modified.

OpenChange/iCalEvent+MAPIStore.m

@@ -74,6 +74,7 @@
 @implementation iCalEvent (MAPIStoreProperties)
 
 - (void) _setupEventRecurrence: (NSData *) mapiRecurrenceData
+                    inTimeZone: (NSTimeZone *) tz
                       inMemCtx: (TALLOC_CTX *) memCtx
 {
   struct Binary_r *blob;
@@ -87,9 +88,12 @@
     return;
   }
 
-  [(iCalCalendar *) parent
-    setupRecurrenceWithMasterEntity: self
-              fromRecurrencePattern: &pattern->RecurrencePattern];
+  [(iCalCalendar *) parent setupRecurrenceWithMasterEntity: self
+                                     fromRecurrencePattern: &pattern->RecurrencePattern
+                                            withExceptions: pattern->ExceptionInfo
+                                         andExceptionCount: pattern->ExceptionCount
+                                                inTimeZone: tz
+   ];
   //talloc_free (blob);
 }
 
@@ -362,7 +366,7 @@
   value = [properties
                 objectForKey: MAPIPropertyKey (PidLidAppointmentRecur)];
   if (value)
-    [self _setupEventRecurrence: value  inMemCtx: memCtx];
+    [self _setupEventRecurrence: value inTimeZone: userTimeZone inMemCtx: memCtx];
 
   /* alarm */
   [self _setupEventAlarmFromProperties: properties];