productivity/baikal: add timezone workaround for recurrence expansion

As explained in [0], when creating a calendar via the web interface, Baikal
sets cal:calendar-timezone to a timezone string instead of a VTIMEZONE object.
This causes an issue when querying events with expanded recurrences, see [1].

To work around this, create a new DateTimeZone object from the string.

[0] https://github.com/sabre-io/Baikal/issues/1241
[1] https://github.com/sabre-io/Baikal/issues/1325

productivity/baikal/Makefile

@@ -2,6 +2,7 @@ COMMENT=	lightweight CalDAV and CardDAV server
 
 VERSION=	0.11.1
 DISTNAME=	baikal-${VERSION}
+REVISION=	0
 SITES=		https://github.com/sabre-io/Baikal/releases/download/${VERSION}/
 DISTFILES=	${DISTNAME}.zip
 CATEGORIES=	productivity www

productivity/baikal/patches/patch-vendor_sabre_dav_lib_CalDAV_Plugin_php

@@ -0,0 +1,22 @@
+https://github.com/sabre-io/Baikal/issues/1241
+https://github.com/sabre-io/Baikal/issues/1325
+
+Index: vendor/sabre/dav/lib/CalDAV/Plugin.php
+--- vendor/sabre/dav/lib/CalDAV/Plugin.php.orig
++++ vendor/sabre/dav/lib/CalDAV/Plugin.php
+@@ -508,14 +508,7 @@ class Plugin extends DAV\ServerPlugin
+             $tzProp = '{'.self::NS_CALDAV.'}calendar-timezone';
+             $tzResult = $this->server->getProperties($path, [$tzProp]);
+             if (isset($tzResult[$tzProp])) {
+-                // This property contains a VCALENDAR with a single
+-                // VTIMEZONE.
+-                $vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
+-                $calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+-
+-                // Destroy circular references so PHP will garbage collect the
+-                // object.
+-                $vtimezoneObj->destroy();
++                $calendarTimeZone = new DateTimeZone($tzResult[$tzProp]);
+             } else {
+                 // Defaulting to UTC.
+                 $calendarTimeZone = new DateTimeZone('UTC');