random: Add __gnu_cxx::beta_distribution<> class.
* libstdc++-v3/include/ext/random: Add __gnu_cxx::beta_distribution<>
class.
* libstdc++-v3/include/ext/random.tcc: Add out-of-line functions for
__gnu_cxx::beta_distribution<>.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
operators/equal.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
operators/serialize.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
operators/inequal.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
cons/parms.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
cons/default.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
requirements/typedefs.cc: New file.
* libstdc++-v3/testsuite/26_numerics/random/beta_distribution/
requirements/explicit_instantiation/1.cc: New file.
From-SVN: r190954