PR 1839/filesystem
* libcsupport/include/rtems/libio_.h, libcsupport/src/fchdir.c,
libcsupport/src/fdatasync.c, libcsupport/src/fpathconf.c,
libcsupport/src/fsync.c, libcsupport/src/ftruncate.c,
libcsupport/src/read.c, libcsupport/src/readv.c,
libcsupport/src/write.c, libcsupport/src/writev.c: Some calls did not
return proper status for permission errors or incorrectly permissions
at all.
58f3fab959