[evolution-data-server] I#364 - Camel: Add a missing header include into camel-hostname-utils.c

[Milan Crha <mcrha src gnome org>]

commit 09fa66daf14e6314860217c9daf304d351bffb57
Author: Milan Crha <mcrha redhat com>
Date:   Mon Nov 1 16:10:13 2021 +0100

    I#364 - Camel: Add a missing header include into camel-hostname-utils.c
    
    Change suggested by Rainer Herzog.
    
    Closes https://gitlab.gnome.org/GNOME/evolution-data-server/-/issues/364

 src/camel/camel-hostname-utils.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/camel/camel-hostname-utils.c b/src/camel/camel-hostname-utils.c
index 956f6c1cf..57c332fad 100644
--- a/src/camel/camel-hostname-utils.c
+++ b/src/camel/camel-hostname-utils.c
@@ -24,6 +24,7 @@
 
 #include <unicode/uchar.h>
 #include <unicode/uscript.h>
+#include <unicode/ustring.h>
 
 #include "camel-string-utils.h"
 #include "camel-hostname-utils.h"