fix building with glibc-2.16+

lss/linux_syscall_support.h

Index: lss/linux_syscall_support.h
===================================================================
--- lss/linux_syscall_support.h	(revision 17)
+++ lss/linux_syscall_support.h	(working copy)
@@ -240,7 +240,6 @@
   long               ru_nivcsw;
 };
 
-struct siginfo;
 #if defined(__i386__) || defined(__ARM_EABI__) || defined(__ARM_ARCH_3__) \
   || defined(__PPC__)
 
@@ -248,7 +247,7 @@
 struct kernel_old_sigaction {
   union {
     void             (*sa_handler_)(int);
-    void             (*sa_sigaction_)(int, struct siginfo *, void *);
+    void             (*sa_sigaction_)(int, siginfo_t *, void *);
   };
   unsigned long      sa_mask;
   unsigned long      sa_flags;
@@ -285,13 +284,13 @@
   unsigned long      sa_flags;
   union {
     void             (*sa_handler_)(int);
-    void             (*sa_sigaction_)(int, struct siginfo *, void *);
+    void             (*sa_sigaction_)(int, siginfo_t *, void *);
   };
   struct kernel_sigset_t sa_mask;
 #else
   union {
     void             (*sa_handler_)(int);
-    void             (*sa_sigaction_)(int, struct siginfo *, void *);
+    void             (*sa_sigaction_)(int, siginfo_t *, void *);
   };
   unsigned long      sa_flags;
   void               (*sa_restorer)(void);