signal: Move copy_siginfo_to_user to <linux/signal.h>

Having it in asm-generic/siginfo.h doesn't make any sense as it is in no way
architecture specific.  Move it to signal.h instead where several related
functions already reside.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: Fenghua Yu <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: Arnd Bergmann <[email protected]>
Cc: [email protected]
Cc: "David S. Miller" <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 80c7418..a39fedd 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -19,6 +19,8 @@ static inline void copy_siginfo(struct siginfo *to, struct siginfo *from)
 		memcpy(to, from, __ARCH_SI_PREAMBLE_SIZE + sizeof(from->_sifields._sigchld));
 }
 
+int copy_siginfo_to_user(struct siginfo __user *to, const struct siginfo *from);
+
 /*
  * Define some primitives to manipulate sigset_t.
  */