[patch] libstdc++/68825 Fix dejagnu directives in shared_ptr test

[Jonathan Wakely]

This XFAIL test should have been used { dg-do compile } so it doesn't
get marked UNRESOLVED when it fails to compile. The test was also
broken, the assignment operator compiled OK, but because the test used
dg-excess-errors instead of dg-error the later failure for the copy
construction matched it and made it pass. Changing it to dg-error made
it FAIL, until I also constrained the assignment operators.

Tested powerpc64le-linux, committed to trunk.

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