* ntea.cc (NTReadEA): Don't check for global ntea setting, now
it's caller responsibility.
(NTWriteEA): Ditto.
* security.cc (get_file_attribute): Read attribute from EA only
if 'ntea' is enabled.
(set_file_attribute): Ditto.
* path.h: (class path_conv): Add members to store file system
information.
(path_conv::get_drive_type): New function.
* syscalls.cc (stat_worker): Use it.
* path.cc (path_conv::update_fs_info): New functions.
(path_conv::check): Get file system information from device where
file resides. On NTFS, try to read symlink contents from EA.
(get_symlink_ea): New function.
(set_symlink_ea): Ditto.
(symlink): Store symlink in extended attribute, if possible.
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