Build fix, ppc64 needs also a get_sp_from_cpustate function now.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3254 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/ppc64/target_signal.h

@@ -21,4 +21,9 @@ typedef struct target_sigaltstack {
 #define TARGET_MINSIGSTKSZ    2048
 #define TARGET_SIGSTKSZ       8192
 
+static inline target_ulong get_sp_from_cpustate(CPUPPCState *state)
+{
+    return state->gpr[1];
+}
+
 #endif /* TARGET_SIGNAL_H */