[Bug target/117834] libgfortran doesn't compile unless `PTHREAD_RWLOCK_INITIALIZER` is defined

[glex.spb at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117834

--- Comment #2 from Gleb Mazovetskiy <glex.spb at gmail dot com> ---
Looks like the change causing this was introduced in
https://github.com/gcc-mirror/gcc/commit/b806c88fab3f9c6833563f9a44b608dd5dd14de9