osl/unx: Remove ifdefery for ancient NetBSD < 3.0

Change-Id: I808da98a3b825eb2213dbcb6d435baa58bf54a9d
Reviewed-on: https://gerrit.libreoffice.org/12151Reviewed-by: Bryan Quigley <gquigs@gmail.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sal/osl/unx/file_volume.cxx

@@ -156,21 +156,10 @@ oslFileError osl_getVolumeInformation( rtl_uString* ustrDirectoryURL, oslVolumeI
 
 #include <sys/param.h>
 
-/* statvfs() replaced statfs() in 2.99.9 */
-# if __NetBSD_Version__ >= 299000900
-       /* 2.0D or later */
 #   define __OSL_STATFS_STRUCT              struct statvfs
 #   define __OSL_STATFS(dir, sfs)           statvfs((dir), (sfs))
 #   define __OSL_STATFS_ISREMOTE(a)         (((a).f_flag & ST_LOCAL) == 0)
 
-# else
-       /* version before 2.0D */
-#   define __OSL_STATFS_STRUCT              struct statfs
-#   define __OSL_STATFS(dir, sfs)           statfs((dir), (sfs))
-#   define __OSL_STATFS_ISREMOTE(a)         (((a).f_type & MNT_LOCAL) == 0)
-
-# endif /* >2.0D */
-
 #   define __OSL_STATFS_BLKSIZ(a)           ((sal_uInt64)((a).f_bsize))
 #   define __OSL_STATFS_TYPENAME(a)         ((a).f_fstypename)