[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 #3 from Gleb Mazovetskiy <glex.spb at gmail dot com> ---
Note that for OSX 10.4 (aka darwin8) `PTHREAD_RWLOCK_INITIALIZER` can be
defined like this:


#define PTHREAD_RWLOCK_INITIALIZER {_PTHREAD_RWLOCK_SIG_init, {0}}