alpha/boot: fix the breakage from -isystem series...

Signed-off-by: Al Viro <[e-mail]>

arch/alpha/boot/bootp.c

···
 #include <asm/hwrpb.h>
 #include <asm/io.h>
 
-#include <stdarg.h>
+#include <linux/stdarg.h>
 
 #include "ksize.h"
 

arch/alpha/boot/bootpz.c

···
 #include <asm/hwrpb.h>
 #include <asm/io.h>
 
-#include <stdarg.h>
+#include <linux/stdarg.h>
 
 #include "kzsize.h"
 

arch/alpha/boot/main.c

···
 #include <asm/console.h>
 #include <asm/hwrpb.h>
 
-#include <stdarg.h>
+#include <linux/stdarg.h>
 
 #include "ksize.h"
 

arch/alpha/boot/stdio.c

···
 /*
  * Copyright (C) Paul Mackerras 1997.
  */
-#include <stdarg.h>
-#include <stddef.h>
+#include <linux/string.h>
+#include <linux/stdarg.h>
 
 size_t strnlen(const char * s, size_t count)
 {