[PATCH] PR23358 Remove unused template parameter in _Destroy

[Paolo Carlini]

Hi, and sorry about the delay (just back from my vacations)

>The extra template parameter causes specialization to be ignored.
>
Yes, I agree with the analysis in the audit trail. I mean to regtest the
patch locally and apply it to mainline.

We can consider this issue a recently introduced (version 1.19 of
stl_construct.h) rather serious performance regression and I plan to
apply the fix to 4_0-branch too, after additional testing in mainline.

Thanks,
Paolo.