* security.cc: Swap out several functions.
* sec_acl.cc: New file. Move Sun compatibel ACL functions from
`security.cc' to here.
* sec_helper.cc: New file. Move security helper functions from
`security.cc' to here.
* security.h: Changed to accomodate the above changes.
* grp.cc: Replace `group_in_memory_p' by `group_state'.
Eliminate group_sem throughout.
(enum grp_state): New enumeration type.
(read_etc_group): Make race safe.
* security.cc: Eliminate group_sem throughout.
`smbntsec'.
* path.cc (path_conv::check): Check path for being a remote path.
If so and `allow_smbntsec' is set to FALSE, set has_acls to FALSE.
* security.cc: Add global definition for `allow_smbntsec'.
* security.h: Add extern declaration for `allow_smbntsec'.
* fhandler.cc (fhandler_disk_file::open): Eliminate extern declaration
of `allow_ntsec'.
* syscalls.cc: Ditto.
throughout.
* shared.h: Remove.
* cygwin_version.h: New file.
* delqueue.h: New file.
* environ.h: New file.
* host_dependent.h: New file.
* perprocess.h: New file.
* registry.h: New file.
* security.h: New file.