[Bug testsuite/81690] libgomp.c/{target-32,thread-limit-2}.c fail for nvptx: missing usleep

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81690

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Regarding {target-32.c, thread-limit-2.c}, see
  https://gcc.gnu.org/ml/gcc-patches/2020-02/msg00422.html
for a busy-wait implementation, which was supposed get rewritten (see next
message in thread) "using declare variant".