[Bug libgomp/98699] Reset OMP_NESTED to true if OMP_MAX_ACTIVE_LEVELS is > 1.

[longb at cray dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98699

--- Comment #3 from Bill Long <longb at cray dot com> ---
Thanks, Tobias.  GCC 11 should be fine. Great to see you back.