sanitize rt_sigaction() situation a bit

	Switch from __ARCH_WANT_SYS_RT_SIGACTION to opposite
(!CONFIG_ODD_RT_SIGACTION); the only two architectures that
need it are alpha and sparc.  The reason for use of CONFIG_...
instead of __ARCH_... is that it's needed only kernel-side
and doing it that way avoids a mess with include order on many
architectures.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/signal.c b/kernel/signal.c
index 53cd5c4..00cd1ce 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3231,7 +3231,7 @@
 }
 #endif /* __ARCH_WANT_SYS_SIGPROCMASK */
 
-#ifdef __ARCH_WANT_SYS_RT_SIGACTION
+#ifndef CONFIG_ODD_RT_SIGACTION
 /**
  *  sys_rt_sigaction - alter an action taken by a process
  *  @sig: signal to be sent
@@ -3265,7 +3265,7 @@
 out:
 	return ret;
 }
-#endif /* __ARCH_WANT_SYS_RT_SIGACTION */
+#endif /* !CONFIG_ODD_RT_SIGACTION */
 
 #ifdef __ARCH_WANT_SYS_SGETMASK