util/cacheinfo: Add missing include for ppc linux

This include was forgotten when splitting cacheinfo.c out of
tcg/ppc/tcg-target.inc.c (see commit b255b2c8).

For a Centos7 host, the include path

	<signal.h>
	  <bits/sigcontext.h>
            <asm/sigcontext.h>
              <asm/elf.h>
	        <asm/auxvec.h>

implicitly pulls in the desired AT_* defines.
Not so for Debian Jessie.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170711015524.22936-1-f4bug@amsat.org>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

util/cacheinfo.c

@@ -129,6 +129,7 @@ static void arch_cache_info(int *isize, int *dsize)
 }
 
 #elif defined(_ARCH_PPC) && defined(__linux__)
+# include "elf.h"
 
 static void arch_cache_info(int *isize, int *dsize)
 {