[1/2] Add option to disable c++11 std::string small-size

[Mikhail Kashkarov]

Add option to disable c++11 std::string small-sizeoptimization usage.

 Â Â Â  * include/bits/basic_string.h [_GLIBCXX_DISABLE_STRING_SSO_USAGE]:
 Â Â Â  (basic_string::_M_is_local, basic_string::_M_destroy)
 Â Â Â  (basic_string::basic_string, basic_string::basic_string(const _Alloc&))
 Â Â Â  (basic_string::basic_string(basic_string&&))
 Â Â Â  (basic_string::basic_string(basic_string&&, const _Alloc&))
 Â Â Â  (basic_string::operator=(const basic_string&))
 Â Â Â  (basic_string::operator=(basic_string&&))
 Â Â Â  (basic_string::clear()): Disable usage of _M_local_buf if
 Â Â Â  Â _GLIBCXX_DISABLE_STRING_SSO_USAGE is defined.
 Â Â Â  * include/bits/basic_string.tcc [_GLIBCXX_DISABLE_STRING_SSO_USAGE]:
 Â Â Â  (basic_string::_M_construct, basic_string::reserve)
 Â Â Â  (basic_string::_M_replace): Disable usage of _M_local_buf if
 Â Â Â  _GLIBCXX_DISABLE_STRING_SSO_USAGE is defined.
 Â Â Â  * testsuite/basic_string/allocator/char/copy_assign.cc: Support for
 Â Â Â  std::string without SSO.
 Â Â Â  * testsuite/basic_string/allocator/wchar_t/copy_assign.cc: Likewise.
 Â Â Â  * testsuite/21_strings/basic_string/init-list.cc: Likewise.
 Â Â Â  * testsuite/rand/assoc/rand_regression_test.hpp: Likewise.
 Â Â Â  * testsuite/rand/priority_queue/rand_regression_test.hpp: Likewise.

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