[patch] libstdc++/61390 don't redeclare template-parameters

[Jonathan Wakely]

Yo dawg, I heard you like templates, so I renamed the
template-parameters of your template template-parameters so they are
not the same as the template-parameters of your templates.

G++ fails to diagnose this (PR17267) but Clang gives an error and EDG
gives a warning.

Tested x86_64-linux, committed to trunk.

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