[Bug libstdc++/67114] [MinGW64] build failure with POSIX threads enabled

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67114

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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  Attachment #36120|0                           |1
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 36124
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36124&action=edit
Add _GLIBCXX_THREAD_ID_LESS hook for thread ID comparisons

This patch preserves the existing behaviour for most targets but adds a new
macro hook that can be used to define a target-specific alternative in
os_defines.h

This does not require any changes to pthreads-win32. Could you test it?