[evolution] Use camel_application_is_exiting declaration from camel.h

[Milan Crha <mcrha src gnome org>]

commit 086d2cb9813ed888da8672788e4d8efed903f302
Author: Milan Crha <mcrha redhat com>
Date:   Wed Feb 11 17:36:23 2015 +0100

    Use camel_application_is_exiting declaration from camel.h
    
    It's part of camel.h now, thus let's use it, instead of re-declare it.

 mail/e-mail-backend.c    |    3 ---
 mail/e-mail-ui-session.c |    2 --
 2 files changed, 0 insertions(+), 5 deletions(-)
---
diff --git a/mail/e-mail-backend.c b/mail/e-mail-backend.c
index ea2ec3b..beb5eef 100644
--- a/mail/e-mail-backend.c
+++ b/mail/e-mail-backend.c
@@ -65,9 +65,6 @@ enum {
        PROP_SEND_ACCOUNT_OVERRIDE
 };
 
-/* FIXME Kill this thing.  It's a horrible hack. */
-extern gint camel_application_is_exiting;
-
 G_DEFINE_ABSTRACT_TYPE (
        EMailBackend,
        e_mail_backend,
diff --git a/mail/e-mail-ui-session.c b/mail/e-mail-ui-session.c
index ac36bc2..5e3cbe3 100644
--- a/mail/e-mail-ui-session.c
+++ b/mail/e-mail-ui-session.c
@@ -887,8 +887,6 @@ mail_ui_session_authenticate_sync (CamelSession *session,
        return authenticated;
 }
 
-extern gint camel_application_is_exiting;
-
 static void
 mail_ui_session_refresh_service (EMailSession *session,
                                  CamelService *service)