This test case calls std::set_terminate while there is an active
exception. Since LWG 2111 it is unspecified which terminate handler is
used when std::nested_exception::rethrow_nested() calls std::terminate.
With libsupc++ the global handler changed by std::set_terminate is used,
but libc++abi uses the active exception's handler (the one that was
current when the exception was first thrown).
Adjust the test case so that it works with either implementation choice.
So that the process doesn't exit cleanly if std::terminate happens
sooner than expected, use a global variable to control when the "clean
terminate" behaviour happens.
libstdc++-v3/ChangeLog:
* testsuite/18_support/nested_exception/rethrow_if_nested-term.cc:
Call std::set_terminate before throwing the nested exception.
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