[PATCH] 2.5.4-pre6 compile fix for i386/kernel/signal.c

Fixe a compiler warning in signal.c due to a missing prototype for
"do_coredump". 

arch/i386/kernel/signal.c

@@ -20,6 +20,7 @@
 #include <linux/stddef.h>
 #include <linux/tty.h>
 #include <linux/personality.h>
+#include <linux/binfmts.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>