cache-utils: Add missing include file for uintptr_t

Commit 021ecd8b9db37927059f5d3234b51ed766706437 breaks the build for
PPC hosts because it uses uintptr_t without the necessary include file.

uintptr_t is defined in stdint.h, so add this include.

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

cache-utils.h

@@ -2,6 +2,9 @@
 #define QEMU_CACHE_UTILS_H
 
 #if defined(_ARCH_PPC)
+
+#include <stdint.h> /* uintptr_t */
+
 struct qemu_cache_conf {
     unsigned long dcache_bsize;
     unsigned long icache_bsize;