struct timespec on mingw vs. pthreads-win32

[Eric Blake]

The <pthreads.h> shipped with pthreads-win32 is horribly broken; it
pollutes the global namespace with more than just bad macros (such as
the incorrect macros for asctime_r that we are already working around in
time.in.h), but also by including a <config.h> specific to how
pthreads-win32 was configured, which may clash horribly with how the
current package is being compiled.

Rather than making our <time.h> drag in the botched pthreads-win32
header just for struct timespec, is there a way that we can instead keep
the namespace clean by providing our own struct timespec, and then take
stronger measures in our <pthread.h> replacement to work around the
broken <pthread.h> header without penalizing packages like libvirt that
intentionally avoid pthreads-win32 for other reasons?  It looks like the
pthreads-win32 will avoid declaring struct timespec if
HAVE_STRUCT_TIMESPEC is already defined; therefore, it seems like our
replacement <time.h> could define this macro, and our replacement
<pthread.h> could be sure that our replacement <time.h> is included
_prior_ to the include_next of the system <pthread.h> (for just mingw).

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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