Replace 'struct siginfo' with 'siginfo_t'.

glibc 2.16 will remove the undocumented definition of 'struct siginfo'
from <bits/siginfo.h>.

This change is already present in glibc 2.15.90, so qemu compilation
of certain targets (eg. cris-user) breaks.

This struct was always typedef'd to be the same as 'siginfo_t' which
is what POSIX documents, so use that instead.
Signed-off-by: NRichard W.M. Jones <rjones@redhat.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

linux-user/signal.c

@@ -2849,7 +2849,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
     * Arguments to signal handler:
     *
     *   a0 = signal number
-    *   a1 = pointer to struct siginfo
+    *   a1 = pointer to siginfo_t
     *   a2 = pointer to struct ucontext
     *
     * $25 and PC point to the signal handler, $29 points to the
@@ -3255,7 +3255,7 @@ struct target_signal_frame {
 };
 
 struct rt_signal_frame {
-    struct siginfo info;
+    siginfo_t info;
     struct ucontext uc;
     uint32_t tramp[2];
 };
@@ -3474,9 +3474,9 @@ struct target_signal_frame {
 };
 
 struct rt_signal_frame {
-        struct siginfo *pinfo;
+        siginfo_t *pinfo;
         void *puc;
-        struct siginfo info;
+        siginfo_t info;
         struct ucontext uc;
         uint8_t retcode[8];       /* Trampoline code. */
 };

user-exec.c

@@ -588,7 +588,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
 int cpu_signal_handler(int host_signum, void *pinfo,
                        void *puc)
 {
-    struct siginfo *info = pinfo;
+    siginfo_t *info = pinfo;
     struct ucontext *uc = puc;
     unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
     uint32_t insn = *(uint32_t *)pc;