sparc64: Kill CONFIG_SPARC32_COMPAT

It's completely superfluous, CONFIG_COMPAT is sufficient.

What this used to be is an umbrella for enabling code shared
by all 32-bit compat binary support types.  But with the
removal of SunOS and Solaris support, the only one left is
Linux 32-bit ELF.

Update defconfig.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c
index 77a3e85..6afa5ef 100644
--- a/arch/sparc64/kernel/signal.c
+++ b/arch/sparc64/kernel/signal.c
@@ -8,7 +8,7 @@
  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
  */
 
-#ifdef CONFIG_SPARC32_COMPAT
+#ifdef CONFIG_COMPAT
 #include <linux/compat.h>	/* for compat_old_sigset_t */
 #endif
 #include <linux/sched.h>
@@ -531,7 +531,7 @@
 	else
 		oldset = &current->blocked;
 
-#ifdef CONFIG_SPARC32_COMPAT
+#ifdef CONFIG_COMPAT
 	if (test_thread_flag(TIF_32BIT)) {
 		extern void do_signal32(sigset_t *, struct pt_regs *,
 					struct signal_deliver_cookie *);