C11 threads: Fix inaccuracies in testsuite

- tst-mtx-recursive.c: mtx_init fails to use mtx_plain.  Per C11
  specs, using mtx_recursive alone is not supported.  This isn't
  catched because mtx_plain is defined as 0.

- tst-thrd-sleep.c: thrd_sleep returns 0 on success, a negative
  value on failure.  Testing against thrd_success is incorrect.

- tst-tss-basic.c: tss_set is incorrectly checkd for a non-0
  value.  The test should test aginst C11 threads error codes.
  This isn't catched because thrd_success is defined as 0.

Note that all three tests fail on FreeBSD, which defines all mutex type
values, as well as all C11 threads error codes with non-0 values.

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