target-ppc: remove dead code

Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6055 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/exec.h

@@ -32,7 +32,6 @@
 #define USE_PRECISE_EMULATION 1
 
 register struct CPUPPCState *env asm(AREG0);
-#define TDX "%016" PRIx64
 
 #if !defined(CONFIG_USER_ONLY)
 #include "softmmu_exec.h"