Add a new 'union l_sigval' to use in place of 'union sigval' in the linux siginfo structure.  l_sigval uses a l_uintptr_t for sival_ptr so that sival_ptr is the right size for linux32 on amd64.  Since no code currently uses 'lsi_ptr' this is just a cosmetic nit rather than a bug fix.
Add a new 'union l_sigval' to use in place of 'union sigval' in the
linux siginfo structure.  l_sigval uses a l_uintptr_t for sival_ptr so
that sival_ptr is the right size for linux32 on amd64.  Since no code
currently uses 'lsi_ptr' this is just a cosmetic nit rather than a bug
fix.

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