fs.c: use statfs/statvfs
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50071 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fs.c: use statfs/statvfs
statfs/statvfs. [ruby-core:68624] [Bug #10998]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50071 b2dd03c8-39d4-4d8f-98ff-823fe69b080e