[gnome-settings-daemon] tz.c: compiler warning: implicit declaration of function ‘islower’

[Rui Matos <rtcm src gnome org>]

commit de63819fb042e5af24d9aa1bec8c6540255ed01d
Author: Alan Coopersmith <alan coopersmith oracle com>
Date:   Sat Jun 10 12:28:34 2017 -0700

    tz.c: compiler warning: implicit declaration of function ‘islower’
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783641
    
    Signed-off-by: Alan Coopersmith <alan coopersmith oracle com>

 plugins/datetime/tz.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/datetime/tz.c b/plugins/datetime/tz.c
index 1acf34c..034d63d 100644
--- a/plugins/datetime/tz.c
+++ b/plugins/datetime/tz.c
@@ -29,6 +29,7 @@
 #include <time.h>
 #include <math.h>
 #include <string.h>
+#include <ctype.h>
 #include "tz.h"