[evolution-ews] Use icaltime_is_utc() instead of icaltimetype::is_utc

[Milan Crha <mcrha src gnome org>]

commit ba9b38d2ab20c81b3ffda37c23de5dba8bc0c40d
Author: Milan Crha <mcrha redhat com>
Date:   Wed Oct 4 11:59:37 2017 +0200

    Use icaltime_is_utc() instead of icaltimetype::is_utc
    
    The structure member is going to be removed from libical in the next release
    and the function is available for a long time, thus it's safe to replace
    the usage in the code.

 src/calendar/e-cal-backend-ews.c  |    4 +---
 src/server/e-ews-calendar-utils.c |    2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/src/calendar/e-cal-backend-ews.c b/src/calendar/e-cal-backend-ews.c
index c0fbec7..e1bed08 100644
--- a/src/calendar/e-cal-backend-ews.c
+++ b/src/calendar/e-cal-backend-ews.c
@@ -1561,9 +1561,7 @@ ecb_ews_get_changes_sync (ECalMetaBackend *meta_backend,
                                        }
 
                                        fb.start.zone = utc_zone;
-                                       fb.start.is_utc = 1;
                                        fb.end.zone = utc_zone;
-                                       fb.end.is_utc = 1;
 
                                        icalcomponent_set_dtstart (vevent, fb.start);
                                        icalcomponent_set_dtend (vevent, fb.end);
@@ -2089,7 +2087,7 @@ ecb_ews_get_timezone_from_ical_component (ECalBackendEws *cbews,
                        struct icaltimetype dtstart;
 
                        dtstart = icalproperty_get_dtstart (prop);
-                       if (dtstart.is_utc)
+                       if (icaltime_is_utc (dtstart))
                                tzid = "UTC";
                }
        }
diff --git a/src/server/e-ews-calendar-utils.c b/src/server/e-ews-calendar-utils.c
index 2e1549a..6e84350 100644
--- a/src/server/e-ews-calendar-utils.c
+++ b/src/server/e-ews-calendar-utils.c
@@ -224,7 +224,7 @@ e_ews_cal_utils_set_time (ESoapMessage *msg,
        g_return_if_fail (tt != NULL);
 
        if (with_timezone) {
-               if (tt->is_utc || !tt->zone || tt->zone == icaltimezone_get_utc_timezone ()) {
+               if (icaltime_is_utc (*tt) || !tt->zone || tt->zone == icaltimezone_get_utc_timezone ()) {
                        tz_ident = g_strdup ("Z");
                } else {
                        gint offset, is_daylight, hrs, mins;