qemu-timer: Remove redundant include statements

qemu-timer.h includes qemu-common.h which already includes time.h,
sys/time.h, windows.h, unistd.h, fcntl.h, errno.h and signal.h.

Therefore those include statements are redundant and can be removed.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
diff --git a/qemu-timer.c b/qemu-timer.c
index 0b28eda..25d5fdc 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -29,23 +29,16 @@
 
 #include "hw/hw.h"
 
-#include <unistd.h>
-#include <fcntl.h>
-#include <time.h>
-#include <errno.h>
-#include <sys/time.h>
-#include <signal.h>
+#include "qemu-timer.h"
+
 #ifdef __FreeBSD__
 #include <sys/param.h>
 #endif
 
 #ifdef _WIN32
-#include <windows.h>
 #include <mmsystem.h>
 #endif
 
-#include "qemu-timer.h"
-
 /***********************************************************/
 /* timers */