* winsup.api/ltp/dup03.c: New test.

* winsup.api/ltp/dup03.c: New test.
* winsup.api/ltp/lseek03.c: Ditto.
* winsup.api/ltp/mmap001.c: Ditto.
* winsup.api/ltp/read01.c: Ditto.
* winsup.api/ltp/readdir01.c: Ditto.
* winsup.api/ltp/rmdir05.c: Ditto.
* winsup.api/ltp/sbrk01.c: Ditto.
* winsup.api/ltp/select02.c: Ditto.
* winsup.api/ltp/select03.c: Ditto.
* winsup.api/ltp/signal03.c: Ditto.
* winsup.api/ltp/stat06.c: Ditto.
* winsup.api/ltp/unlink08.c: Ditto.
* winsup.api/known_bugs.tcl: Update to reflect new test's known
failures.
* winsup.api/winsup.exp: Don't delete executable in case of
unexpected pass, as well as in case of unexpected failure.
* README: Update paragraph about expected failures.