[Bug libstdc++/56482] missing -lpthread in configure when checking for pthreads_num_processors_np

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56482

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 32993
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32993&action=edit
change GCC_TRY_COMPILE_OR_LINK test to AC_TRY_COMPILE

Does this patch (against trunk) solve the problem?