tcg: Remove unneeded include statements

The standard include files are already included in qemu-common.h.

malloc.h and alloca.h were needed for alloca() which was removed
from TCG code some years ago when switching from dyngen to TCG
(see commit 49516bc0d6).

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

tcg/tcg.c

@@ -33,18 +33,6 @@
 #define NDEBUG
 #endif
 
-#include <stdarg.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <inttypes.h>
-#ifdef _WIN32
-#include <malloc.h>
-#endif
-#ifdef _AIX
-#include <alloca.h>
-#endif
-
 #include "qemu-common.h"
 #include "cache-utils.h"
 #include "host-utils.h"