[PATCH 1/3] Disable test using std::set_unexcepted for C++17

[Jonathan Wakely]

This function has been removed from C++17, along with dynamic
exception specifications. We haven't removed the function from the
headers yet, but this ensures the test won't start failing once the
front end starts giving an error for the exceptions specs.

	* testsuite/18_support/bad_exception/59392.cc: Disable for C++17.

Tested powerpc64le-linux, committed to trunk.

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