linux-user: Remove unused code

The code is unused since 8 years, so remove it.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

linux-user/signal.c

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 89276eb..40c5eb1 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -1274,10 +1274,7 @@
 
 		if (__put_user(retcodes[idx], rc))
 			return 1;
-#if 0
-		flush_icache_range((abi_ulong)rc,
-				   (abi_ulong)(rc + 1));
-#endif
+
 		retcode = rc_addr + thumb;
 	}