Cited from mount(8):
```
strictatime
Always update the file access time when reading from a
file. Without this option the filesystem may default to a
less strict update mode, where some access time updates
are skipped for performance reasons. This option could be
ignored if it is not supported by the filesystem.
```
to use statvfs().
* ext/-test-/file/extconf.rb: check the existence of
sys/statvfs.h
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50423 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/-test-/file/fs.c (get_fsname): try magic number only if
f_type is included. [ruby-dev:48913] [Bug #11000]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e