Adapt to Clang 15 trunk increase in ElabortatedType sugar

...<https://github.com/llvm/llvm-project/commit/bdc6974f92304f4ed542241b9b89ba58ba6b20aa>
"[clang] Implement ElaboratedType sugaring for types written bare".

For one, it caused diagnostics to now emit 'OString' instead of 'rtl::OUString'
etc., which required adapting a number of tests.

For another, some tests started to fail because the relevant plugins didn't
expect ElaboratedType sugar in places where it now occurs:

> error: 'error' diagnostics expected but not seen:
>   File compilerplugins/clang/test/redundantcast.cxx Line 297: redundant cstyle cast from 'Enum1' to 'Enum1' [loplugin:redundantcast]
>   File compilerplugins/clang/test/redundantcast.cxx Line 308: redundant cstyle cast from 'Enum1' to 'Enum1' [loplugin:redundantcast]

> error: 'error' diagnostics expected but not seen:
>   File compilerplugins/clang/test/referencecasting.cxx Line 25 (directive at compilerplugins/clang/test/referencecasting.cxx:24): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 37 (directive at compilerplugins/clang/test/referencecasting.cxx:36): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 48 (directive at compilerplugins/clang/test/referencecasting.cxx:47): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 100 (directive at compilerplugins/clang/test/referencecasting.cxx:99): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 120 (directive at compilerplugins/clang/test/referencecasting.cxx:119): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 188 (directive at compilerplugins/clang/test/referencecasting.cxx:187): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 200 (directive at compilerplugins/clang/test/referencecasting.cxx:199): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]
>   File compilerplugins/clang/test/referencecasting.cxx Line 206 (directive at compilerplugins/clang/test/referencecasting.cxx:205): the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]

> error: 'error' diagnostics seen but not expected:
>   File compilerplugins/clang/test/typedefparam.cxx Line 42: function param 1 at definition site does not match function param at declaration site, 'FooT *' (aka 'test2::Foo *') vs 'struct Foo *' [loplugin:typedefparam]
>   File compilerplugins/clang/test/typedefparam.cxx Line 55: function param 1 at definition site does not match function param at declaration site, 'FooT *' (aka 'test3::Foo *') vs 'Foo *' [loplugin:typedefparam]
> error: 'note' diagnostics seen but not expected:
>   File compilerplugins/clang/test/typedefparam.cxx Line 40: declaration site here [loplugin:typedefparam]
>   File compilerplugins/clang/test/typedefparam.cxx Line 53: declaration site here [loplugin:typedefparam]

Hopefully, there are not too many places in our plugins left that similarly
don't expect ElaboratedType sugar in certain places, but which are not covered
by tests.  At least, a full build didn't turn up any further false positives,
but there may of course be false negatives now that would go undetected.

Change-Id: I9bfb1cfb57df5f6e228b512c19c664d48285b675
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137049
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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