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This provides a working thread::hardware_concurrency on platforms that support pthread_num_processors_np or the "hw.ncpu" sysctl, but by testing for the features in configure rather than hardcoding OS macro tests in thread.cc
* acinclude.m4 (GLIBCXX_CHECK_SC_NPROC_ONLN): Define. (GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP): Define. (GLIBCXX_CHECK_SYSCTL_HW_NCPU): Define. * configure.ac: Use new checks. * configure: Regenerate. * config.h.in: Regenerate. * src/thread.cc: Check new config macros. * testsuite/lib/libstdc++.exp: Likewise.
Tested x86_64-linux and x86_64-netbsd5.1, committed to trunk <nprocs.patch>
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