linux-user: Support f_flags in statfs64 when available.

[Frajo <franz.haider@jolla.com>]

linux-user: Support f_flags in statfs64 when available.
Same as d4247ec2d79ef2477cb886fa688706b068119736 but for statfs64
When running rpm within qemu-arm-dynamic this could cause rpm fail with 
an error like
"installing package A needs B MB on the C filesystem" depending on what 
is in memory in f_flags.
https://github.com/rpm-software-management/rpm/blob/af06db1d5558870f7fb8f5c502572c2d27af5c71/lib/transaction.c#L164

 From 6ceb5662b5fae827d2c0cdd9896eec75997c060a Mon Sep 17 00:00:00 2001
From: Franz-Josef Haider <franz.haider@jolla.com>
Date: Thu, 30 Jan 2020 14:28:24 +0200
Subject: [PATCH 1/1] linux-user: Support f_flags in statfs64 when available.

Same as d4247ec2d79ef2477cb886fa688706b068119736 but for statfs64

Signed-off-by: Franz-Josef Haider <franz.haider@jolla.com>
---
  linux-user/syscall.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d60142f069..45782b1009 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8997,6 +8997,11 @@ static abi_long do_syscall1(void *cpu_env, int 
num, abi_long arg1,
              __put_user(stfs.f_fsid.__val[1], &target_stfs->f_fsid.val[1]);
              __put_user(stfs.f_namelen, &target_stfs->f_namelen);
              __put_user(stfs.f_frsize, &target_stfs->f_frsize);
+#ifdef _STATFS_F_FLAGS
+            __put_user(stfs.f_flags, &target_stfs->f_flags);
+#else
+            __put_user(0, &target_stfs->f_flags);
+#endif
              memset(target_stfs->f_spare, 0, sizeof(target_stfs->f_spare));
              unlock_user_struct(target_stfs, arg3, 1);
          }
-- 
2.20.1