make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect

... and switch i386 to HAVE_SYSCALL_WRAPPERS, killing open-coded
uses of asmlinkage_protect() in a bunch of syscalls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/fork.c b/kernel/fork.c
index 8d932b1..e1f34ab 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1674,10 +1674,7 @@
 		 int, tls_val)
 #endif
 {
-	long ret = do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr);
-	asmlinkage_protect(5, ret, clone_flags, newsp,
-			parent_tidptr, child_tidptr, tls_val);
-	return ret;
+	return do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr);
 }
 #endif