* dir.cc (opendir): Call fhandler's opendir with fd set to -1.
(fdopendir): New function.
(seekdir64): Use dirent_info_mask.
(rewinddir): Ditto.
(closedir): Only release underlying file descriptor if it has been
reserved by opendir itself.
* fhandler.cc (fhandler_base::opendir): Accommodate new parameter.
* fhandler.h (dirent_states): Add dirent_valid_fd and dirent_info_mask.
(fhander_XXX::opendir): Add file descriptor parameter. Use regparms.
(fhandler_procnet::opendir): Drop declaration.
* fhandler_disk_file.cc (fhandler_disk_file::opendir): Ditto.
If called from fdopendir, use existing handle to re-open directory
with valid flags. Rename fd to cfd. Use only if no valid incoming fd.
(fhandler_cygdrive::opendir): Accommodate new parameter.
* fhandler_process.cc (fhandler_process::opendir): Ditto.
* fhandler_procnet.cc (fhandler_procnet::opendir): Drop definition.
* fhandler_virtual.cc (fhandler_virtual::opendir): Accommodate new
parameter. Only create new file descriptor entry if called from
opendir. Remove duplicated setting of dir->__flags.
* posix.sgml: Add fdopendir to list of implemented Solaris functions.
* include/cygwin/version.h: Bump API minor number.
* include/sys/dirent.h: Declare fdopendir.
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