[evolution-data-server/wip/mcrha/libical-glib] Add -DLIBICAL_GLIB_UNSTABLE_API=1 into CALENDAR_CFLAGS

[Milan Crha <mcrha src gnome org>]

commit 8ea83761fbe4a7fc908de5ab356877569a7ef947
Author: Milan Crha <mcrha redhat com>
Date:   Fri Feb 1 09:32:57 2019 +0100

    Add -DLIBICAL_GLIB_UNSTABLE_API=1 into CALENDAR_CFLAGS
    
    libical-glib will require it, thus make it work beforehand.

 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8db800bc4..d11753df1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -909,7 +909,7 @@ pkg_check_modules(CALENDAR REQUIRED gio-2.0 libical-glib>=${libical_glib_minimum
 set(ADDRESSBOOK_CFLAGS ${ADDRESSBOOK_CFLAGS} ${PHONENUMBER_DEFINITIONS})
 set(ADDRESSBOOK_INCLUDE_DIRS ${ADDRESSBOOK_INCLUDE_DIRS} ${PHONENUMBER_INCLUDE_DIRS})
 set(ADDRESSBOOK_LDFLAGS ${ADDRESSBOOK_LDFLAGS} ${PHONENUMBER_LDFLAGS})
-set(CALENDAR_CFLAGS ${CALENDAR_CFLAGS})
+set(CALENDAR_CFLAGS ${CALENDAR_CFLAGS} -DLIBICAL_GLIB_UNSTABLE_API=1)
 
 pkg_check_modules(CAMEL REQUIRED gio-2.0 gmodule-2.0 ${mozilla_nss} ${mozilla_nspr} 
sqlite3>=${sqlite_minimum_version})
 set(CAMEL_CFLAGS ${CAMEL_CFLAGS} ${KRB5_CFLAGS} ${MANUAL_NSS_CFLAGS} ${MANUAL_NSPR_CFLAGS} ${ICU_CFLAGS})