[Bug target/117834] [14/15 Regression] libgfortran doesn't compile unless `PTHREAD_RWLOCK_INITIALIZER` is defined on powerpc-darwin since r14-6425

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

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

--- Comment #4 from Gleb Mazovetskiy <glex.spb at gmail dot com> ---
Created attachment 59750
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59750&action=edit
example patch for tiger

The following patch fixes that particular error (the proper fix should probably
be either guarded for darwin8 or avoid that function altogether).