qga: Clean up includes

Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.

This commit was created with scripts/clean-includes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1454089805-5470-9-git-send-email-peter.maydell@linaro.org
diff --git a/qga/channel-posix.c b/qga/channel-posix.c
index 50d9dd3..7ad3c00 100644
--- a/qga/channel-posix.c
+++ b/qga/channel-posix.c
@@ -1,11 +1,6 @@
+#include "qemu/osdep.h"
 #include <glib.h>
 #include <termios.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <string.h>
-#include "qemu/osdep.h"
 #include "qemu/sockets.h"
 #include "qga/channel.h"