fix implicit declaration of syscall() in linux-user/mmap.c

From f293c406dd2fe751244f2beef4782ccec65fd307 Mon Sep 17 00:00:00 2001
From: John Spencer <[email protected]>
Date: Mon, 10 Dec 2012 06:49:57 +0100
Subject: [PATCH 1/4] fix implicit declaration of syscall() in linux-user/mmap.c

on glibc, this header is getting pulled in automatically via another header, however on musl we need to include it explicitly.

linux-user/mmap.c:705:9: warning: implicit declaration of function 'syscall' linux-user/mmap.c:705:9: warning: nested extern declaration of 'syscall'

---
 linux-user/mmap.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

index b412e3f..171b449 100644
@@ -25,6 +25,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
+#include <sys/syscall.h>
 #include <linux/mman.h>
 #include <linux/unistd.h>
 

1.7.3.4