[libgtop] Fixed build problem with procmap example

[Robert Roth <robertroth src gnome org>]

commit 421419fdbfeb7340f00389d114ab6ae4227d89d9
Author: Robert Roth <robert roth off gmail com>
Date:   Fri Jun 26 03:10:51 2015 +0300

    Fixed build problem with procmap example

 examples/procmap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/examples/procmap.c b/examples/procmap.c
index e451eeb..b32555b 100644
--- a/examples/procmap.c
+++ b/examples/procmap.c
@@ -39,6 +39,8 @@
 #include <sys/resource.h>
 #include <sys/mman.h>
 
+#include <fcntl.h>
+
 #ifndef PROFILE_COUNT
 #define PROFILE_COUNT  1
 #endif