[MIPS] signals: Share even more code.

native and compat do_signal and handle_signal are identical and can easily
be unified.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/compat-signal.h b/include/asm-mips/compat-signal.h
index 20ac29ff..6599a90 100644
--- a/include/asm-mips/compat-signal.h
+++ b/include/asm-mips/compat-signal.h
@@ -5,6 +5,9 @@
 #include <linux/compat.h>
 #include <linux/compiler.h>
 
+#include <asm/signal.h>
+#include <asm/siginfo.h>
+
 #include <asm/uaccess.h>
 
 static inline int __copy_conv_sigset_to_user(compat_sigset_t __user *d,