glfs-util: Include <sys/stat.h> header for S_ISDIR

Signed-off-by: Kaleb S. KEITHLEY <[email protected]>

Author: kalebskeithley

src/glfs-util.c

@@ -22,6 +22,7 @@
 
 #include "glfs-util.h"
 
+#include <sys/stat.h>
 #include <assert.h>
 #include <errno.h>
 #include <error.h>